As said in the match day posts, it's down to match fitness. The pre season games were very low key with various fringe players playing in various positions. There was no intensity from our players. This may have been a deliberate strategy from Bobby. Only time will tell, as in when the real games kick in (cups, euros, the final 3rd of the season).
Certainly the reason for the shipping of late goals is the WHOLE team tiring. It's not down to individuals, or tactics or whatever. Just match fitness. If it's still the same in a few games time, I'm worried. Right now, I'm no where near worried.