Eurowings flight 1170 enroute from Dusseldorf to Cancun was approximately 200 miles west of Ireland when the flight turned around and returned to Dusseldorf for "technical reasons". Apparently, the "technical reasons" were enough for the company to have the flight return to its point of departure but not severe enough to warrant a landing at the closest airport. The attached audio file includes communication while the flight was with Shannon Control; there is no audio available after they entered London Control.
Ron