FRA-TRN On four occasions that I have flown with them one was delayed for an hour because of instrument malfunction. Flap warning light. The second flight was cancelled because of instrument malfunction. The compass did not work. Fifty minute wait on board while the technicians worked then another attempt at departure which failed. No assistance from FA's just a twenty minute wait on board for the bus that took us back to the terminal. It seems that instrument malfunction is plagueing EW recently.