Bad ground??? Service panel updated!! Dim lights
Possible Neutral Out
Get a multimeter. Check voltage at several different receptacles - all should read about the same ~ 120V. If you have a 240V receptacle - e.g., electric dryer - check from each hot to neutral and between hots - you should get ~ 120V for each hot to neutral and ~ 240V between hots.
If you get find that some receptacles are way above 120V and some receptacles below 120V, and particularly if you find that a 240V receptacle has something other than 1/2 the voltage on each individual hot-to-neutral (e.g., 240V hot-to-hot but 130V on one hot-to-neutral and 110V on the other hot-to-neutral), and also if the voltage changes significantly when you turn various appliances on and off, then you very likely have a LOST NEUTRAL. That is a dangerous situation and is normally a CALL THE POWER COMPANY IMMEDIATELY situation because most of the time it is on their side of the meter.
Another possibility is a one leg of your service is out. Less likely based on your description as typically then certain things would start/stop working when a 240V appliance (e.g., dryer, oven, air conditioner, water heater) is turned on/off. But that is also a CALL THE POWER COMPANY situation.
That being said, anything can happen and these same problems (as well as many others) can be the result of circuit breaker panel problems. But I'd get a multimeter and if you find high/low then definitely call the electric company.