I have noticed more and more instances when the Quick Setting Buttons don't work. They time out with an app message like "comms not available" (of course I can't replicate the fault now to get the exact text. This only started to happen this year but my system is nearly three years old (AC3 gen 1) and nothing about my wifi has changed for 2 years (router close to inverter)

Do you have any idea what's going on and how I could fix it?