Sounds like you have lost one of the hot legs. At the panel check both hot legs at the top of the panel and all of the double pole breakers hot leg to neutral. Should be 120 volts. You may find one that one has no voltage reading. Is the dryer motor 240 volts? Usually 120 volts. You may also have lost the neutral connection. That would effect the MWBC but not the dryer unless it is gas.