That's a terrible ping time, but that doesn't impact your connection to WiFi. You have plenty of bandwidth for anything other than 4K, which is right at the edge.
But disconnecting from the WiFi has nothing to do with your speed or latency. There's something wrong with either your Roku or your router. The Roku might be getting too warm, so if you don't have one of the free HDMI extender cables from Roku you should request one. Moving the Stick away from the TV allows better airflow around it. And it's always possible there's something defective with the Roku. Of all my Roku devices, only a couple have a wired connection, all the rest use WiFi. I don't have any issues with keeping a connection.
For the router, there's too many things to suggest to check, really. Every brand has different settings. If your router doesn't support 5 GHz, I suggest replacing it with one that does. 5 GHz has a bit less range but overall much higher bandwidth and less interference on that band.
And that actually brings one one other thing: interference. Sometimes other devices within the same frequency band that WiFi uses can disrupt your WiFi connection, sometimes even breaking it. The first step to try is to change the channel your WiFi uses. On 2.4 GHz, you should use channel 1, 6 or 11. On 5 GHz, use channel 48 or lower, or channel 149 or higher. The channels in the middle are unsupported by Roku devices.
Dan
Roku Community Streaming Expert
Help others find this answer and click "Accept as Solution."
If you appreciate my answer, maybe give me a Kudo.
I am not a Roku employee, just another user.
