@boogieko-
If this is a Roku TV with "Fast TV start" not enabled, see if turning this on helps to keep the set's wifi connection alive.
Settings > System > Power > Fast TV Start
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.
If this post solves your problem please help others find this answer by clicking "Accept as Solution.".
Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X