Hi kook i agree with colif , get a surge protector at this time of year when you might get a power cut or a sudden surge of electricity it could blow your gear. Some of them even guarantee to replace anything connected to them if they fail.
i read your comments and was wondering , if you have some house lights on and you switch your carpet hoover on , does the light dip for a split second. If yes then have a look at your fuses box. What size are the rcd trips , all mine are 16 amp and when we have alterations done we had a wheelchair lift put in. The circuit that the lift was on had to be increased to a 20 because when i turned the lift on it would sometimes pop the trip.