Today I found that I lost some pistons and some hours later I was using the ME Crafting to make a new one, then the Iron Ingots in my ME storage did not respond and I tried to relog, after that they where all gone.
I did a search online and on reddit I found a thread 2 months old saying that there had been a report of bugs with the Extra Cells ME storage. So I recommend that people are careful when using the Extra Cells adds to the ME system, at least I recommend not to use the Blast resistant ME Drive.