Wifi Dropping Issues - Mainly after DHW

Hey all, can anyone help with my query?

My setup often drops its Wifi on and off over the last few days, I am unsure why.

There seems to be a pattern after a DHW heat then it looses the connectivity. I then have to enable the Wifi AP connectivity to get it to work again. I then have also lost the data for that period.

See todays data and if you look back on 9th April

Anyone know what causes this and how I can stop it?