Typical symptoms of an open neutral. At your main panel measure between the two hots (or any 240v breaker), you should get 240v or close. Then measure between one hot and neutral at the main panel, then the other, varying loads, small space heaters make good loads since they take quite a bit of current. As you move it around and take repeated readings from both hots to neutral, document the readings. It's almost certainly a PoCo issue. This is very serious, open neutrals can do a lot of damage.
George Anderson
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