Modem keeps kicking some devices off wifi

We have Fiber our modem is PRV65B444A-S-TS Telus Wi-fi Hub. We are having to re-set the router once or twice a day because certain devices are getting kicked off the wifi for no reason. Examples are my husband's google pixel phone or his window computer and our sonos speakers will be working one minute, and the next minute they're disconnected. Once they're disconnected we can't reconnect without re-setting the router. We're not going out of range or anything this just happens at random times during the day.