We can only advise you what we have found works for us. If you don't want to follow the given advice, that's up to you.
Personally I think some/most?/all? Rokus don't recover from router upsets/instabilities that other devices may not have a problem with.
For what it's worth, I used to have to re-establish the wifi connection on the much used Streaming Stick+ in my living room several times a month. I've not had to reset it in the couple months since replacing my old Western Digital router with a new Asus.
I've also wondered if it is upsets occurring while the Roku is actually streaming that cause the problem since I only had to re-connect my living room Roku which gets MUCH more daily use than the other units.
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
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Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X