If you have an overvoltage condition that fluctuates between 127 and 131 volts or higher, then the problem could be an open or loose/corroded neutral at your service panel. Have an electrician check it out. Also, an electrician will probably have a more precise meter to confirm that you do in fact have an overvoltage problem.
If inside the house is okay, then call your utility company. Tell them in no uncertain terms that you have an overvoltage condition and are concerned safety-wise, damage, etc. Insist they come out to check so the responsibility will be on them. It's possible there's a problem with the service wires coming from the pole or something else on their end. The utility is obligated to provide power ranging from 114 to 126 volts VAC RMS at your doorstep. Your equipment power supplies will handle between 110V to 127V and perform to spec (barely at the extremes). Anything greater than 127 Volts RMS can cause damage.
In the meantime, you should get a voltage stabilizer like a TippLite to protect your equipment.
If inside the house is okay, then call your utility company. Tell them in no uncertain terms that you have an overvoltage condition and are concerned safety-wise, damage, etc. Insist they come out to check so the responsibility will be on them. It's possible there's a problem with the service wires coming from the pole or something else on their end. The utility is obligated to provide power ranging from 114 to 126 volts VAC RMS at your doorstep. Your equipment power supplies will handle between 110V to 127V and perform to spec (barely at the extremes). Anything greater than 127 Volts RMS can cause damage.
In the meantime, you should get a voltage stabilizer like a TippLite to protect your equipment.