Open Refreigerator door trips other breakers
They don't have to be adjacent to be a MWBC sharing a neutral, just on different legs and without handle ties. Handle ties were not always required. Fridge's have been known to trip GFCI breakers. Try switching it to a non GFCI. Why is the adjacent room on a GFCI?  If possible try a regular breaker on that room too.