shop99er
Try unplugging your Streaming Stick for a bit, at least 5-10 minutes. (let it cool down and take notice it if seems to be "overly" hot).
If seems to work better after a cool-down period, you may want to get a extender cable to get it away from the heat of the television. Roku offers a free one, but you can get a longer one at any walmart, target, best buy etc. (it is just a hmdi cable with a female and male end).
If the cooldown doesn't work, you could try a Factory Reset. (press and hold the reset button for 30+ seconds). **Just make sure you have a working physical Roku remote before performing a Factory Reset.
If you perform the factory reset, you will have to set up the stick like it was new (just use the same email address you initially did) and then you will likely need to login to all your subscriptions again. Basically, used as a last resort.
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Prior to doing the cooldown and/or factory reset, go to Settings/Network/Check Connection and see what your "internet download speed" is reporting. If you have a mobile hotspot available to you, I would also try connecting to it instead of your router and see if that makes a difference. If not, then can rule out a network issue and kind of narrowing it down to a device issue.