Today while trying to upgrade my FBA my game lagged when I hit enhance and it seemed to use the items from my inventory but gave me no upgrade or confirmation of such.  

 

Please excuse the crude picture lol 

 

The first one registered and failed.  The second one lagged and didn't confirm or anything so I hit the home button after a minute or so.  I wasn't sure at that point if it had just failed so broke down another FBA and tried and failed the third one.  

It seems it consumed my items still because I know I had enough for two upgrades when I started but if you go by my events log it clearly shows I had to break one down first to get 2 chances.  

This appears to have been a failed enhancement, it took the items as expected but the server encountered an issue before the event could be created.

I'll leave this on 'Reproduced' status at the moment as it could do with improvement in the future.