My game has the same issue. If i turned off admod, everythings went smoothly. And then turn on the admob, while the ad is loading, some lags happened about 1-10 seconds . After the ad is showed and closed, the lags happened all the time, it caused my game crashed. I have searched a solution for 1 week, but no clue. This issue was still not resolved from year 2013 till to now .... It made me have to turn off the admob in my game = no money >.<
P/S : I'm using Interstitial only ads and this bug is only happened in low-end Android devices. Some my testing mobile phones have these bug : Dragon Touch Y88, Samsung Galaxy Trend Plus, MeMO PAD ...
Can anyone share me the solution for this please ? My email : email@example.com
.Thank you for any advices.