bluetooth could be the culprit if the alarm operates in the same frequency band (2.4ghz for bluetooth)... or if the antenna in your tablet is not tuned correctly (durring manufacture) thus causing it to radiate inefficiently and give off spurious signals at multiples of the frequency. (i.e. citizen band radio in the U.S. is in the 27 mhz band and T.V. ch 2 is around 54 mhz... so there you are watching the game and some nut with an homemade CB antenna is messing up the signal by talking to his buddies about how good the game looks now that he has cable T.V.)

Have Fun
Ben