Since BackgroundExecutor uses SystemClock.currentTimeMillis() as base for delay calculation, a change in System Clock (as for example when the Daylight Saving Time starts or ends) can trigger or delay a thread execution, this can lock up the serial execution queue an cause major problems.
A possible solution to this problem would be to use SystemClock.elapsedRealtime() .

AndroidAnnotations version:
4.2.0
Android compile SDK version:
25