Playback Issues - Audio/Video & Power

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qczman2
Level 7

Roku 4800 ultra issues heat related?

First off, I want to say I am a long time Roku users and currently have may products which work well and I enjoy.  Recently I switched out mu previous model ultra (4660X2) for the new 4800 model to get full support for Dolby Vision and Dolby Atmos. Since then I have had problems in two areas which seem to impact others.

1.  When a streaming show starts up initially or after a brief pause, the show starts but the audio starts up 1 second or two later.

2. If I paused for more than approximately 2 minutes, when I un-paused the streaming service (doesn't seem to matter which one, I verified it happens on Prime, Netflix and HBO max), audio doesn't come back on. I f I try to switch the TV input, everything freezes and the TV (i think also the Roku, but am not sure) reboots. After which I am back to the same boat (audio start lag, and can't pause it for more than 2 minutes.  I have tried different cables, factory reset, changing audio settings, nothing works. The old 4660x2 ultra works fine if I swap it back.

My setup is a 2018 VISO Quantum X set, and VISO sound bar, surround system with Atmos.

During my latest attempt at trouble shooting, I noticed something interesting.  When trying my third HDMI cable, I noticed the hard surface the Roku was placed on was very warm to the touch (102-105 F?).  SO on a hunch I tried something.  I put the Roku on top of 2 inch long small plastic risers that were one-inch high (just on the outside edges)  to improve air circulation.  Wow, what a difference.  Almost no audio startup delay on stream start.  And now I can pause it for over 5 minutes and unpause- no problem with audio coming back.  I even went 11 Minutes on pause and audio came back fine (although it locked up the audio with a loud buz when I tried to rewind).  I also noticed than in normal operation the unit now stays cool, but stills warms up a bit when I pause for more than 1 minute or so.

This makes me wonder if some of the similar problems people are having with the 4800s are related heat in some way?  I'd be curious if any of you who have been having these types of issue would try to see if doing something to improve heat dissipation makes any difference.

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makaiguy
Community Streaming Expert

Re: Roku 4800 ultra issues heat related?

Sounds like some good troubleshooting.  I'll be interested to see what sort of response you get.

Roku Community Streaming Expert

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Roku Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X | Roku Streaming Stick 3600
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atc98092
Community Streaming Expert

Re: Roku 4800 ultra issues heat related?

I haven't had any issues with my 4800. It sits on top of my HTPC case, but the case does not vent on the top so it's a relatively cool place. I just went downstairs to feel how warm it is. Now it's only in standby mode, as I haven't used it since yesterday afternoon. But it barely feels warm at all. Enough to tell it's powered up, but not in any way overly warm. I'll likely use it again this afternoon and I'll see if it warms noticeably. You might check to see if any case openings have gotten anything blocking them. 

Dan

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dathead2
Level 10

Re: Roku 4800 ultra issues heat related?

1.  When a streaming show starts up initially or after a brief pause, the show starts but the audio starts up 1 second or two later.

This started happening to me too just last week (new software rollout?) on Roku 2018 model ultra    Only a minor annoyance   Not seeing the other major audio issues you describe  

Roku Ultra 4660X
RokuOS 10.0.0 build 4195
Sony Bravia 55A8G TV
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atc98092
Community Streaming Expert

Re: Roku 4800 ultra issues heat related?

I am currently watching Iron Man 2 on Disney+. This is 4K/Dolby Vision, so I would expect it to be stressing the 4800 to the max. I placed my hand on the Ultra case and it's no warmer than it felt when it hadn't been used for hours, just slightly warm. 

My personal opinion is there's no heat issue with the 4800 by default. There appears to be individual units with issues that could be due to several reasons. There could be a defect in the cooling ducts that blocks airflow, there could be a defective piece of hardware, or it could simply be something related to the environment the device is placed in. Really hard to judge without having the device. 

Dan

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qczman2
Level 7

Re: Roku 4800 ultra issues heat related?

I'll look at the unit to see what I can about the cooling holes.  As to the environment, its sits on an open wood shelf, although I have also tried it on the metal top cover of my 4kBlue Ray to see if that disipates heat better, but it doesnt.

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