your having problems with your switch-box call a electrician he will make the stuff work for you. won't be having these problems. im telling ya. my house is way older than yours its about 49 years old and where still here with no problems
You got a problem with your switch box, fuse box etc, call an electrician to look at it. 25 years could be aluminum wiring and copper mixed causing power surges as well. Don't go messing with the box unless you want a new hair do!
It looks like a voltage problem. Your voltage is unstable. If your neighbors are okay, you need to look through and probably redo the lines connecting your house to the outsource. You need to call an electrician for that.