Can you tell us the model number of the router please?
Are you able to access the router’s Admin pages? If so have you tried changing channels? I assume this is a dual band router (2.4/5 GHz)? If so does the issue exist for both radios?
You could log into the router and save the current configuration to a file, and maybe also take screen grabs of pages where you might have a lot of data to re-enter. Then factory reset the router, set up the minimum necessary to check for wireless functionality, and if all is well try restoring the configuration from the backup file. If you again run into the same issue then factory reset the router again, but this time set up using the data from the screen grabs.
