The usual cause for problems similar to yours is electrical equipment turning on/off.
Washing Machines, Dishwashers, Fridges and Ovens. Kettles and Microwave usually draw too little power to cause this effect, but do not ignore the possibility
Samsung Galaxy Fold review: Hands-on
How to create a robot painting in Photoshop
iMac 21.5in (2019) review
French Days 2019 : dates, sites participants & bons plans