@Coynee
Instead of turning off your TV's CEC, try disabling Roku's CEC 1-touch play feature, and/or Roku's Power-Savings feature that may also be contributing factor and see if one or both helps.
Settings/System/Control other Devices/1-Touch play [uncheck to Disable]
Settings/System/Power/Auto-Powers Savings/20-min [Disable]
Roku Community Streaming Expert
Just another Roku user... I am not a Roku employee.
Insignia RokuTV, Ultra 4660, Premiere+ 3921, Express 4k+ 3941, Streambar 9102
