I will occasionally see the same issue with Prime Video on my 32" S-Series TCL Roku TV. Others have mentioned deleting apps to save some memory resources, but I have 60+ apps on my S-Series and it only happens rarely and only with the Prime Video app. When it does occur I find that doing a RESTART will correct the issue. SETTINGS -- SYSTEM -- POWER -- SYSTEM RESTART -- RESTART. The same as pulling the plug, but you just need your remote to get it accomplished. Probably not a bad idea to just perform a RESTART/REBOOT of this older device weekly to clear out any cobwebs that build up. I still think this is a Prime VIdeo / Roku OS bug more than deleting a large portion of the apps you have installed.
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