Yeah, so this has happened on a couple of occasions and I thought I'd bring it up.

Basically, the what happens is this:

Step 1: Enter mission
Step 2: Get your arse kicked and leave your bot behind to mop the floor with them
Step 3: Enter the mission again to find your bot getting its arse kicked
Step 4: Tell the bot to follow and leave the mission so that you and your bot can recover
Step 5: Bot doesn't recover any HP's
Step 6: Enter a fight and kill mob
Step 7: Still no HP recovery
Step 8: Enter a fight, Bot gets hit, kill mob
Step 9: Bot heals

Basically you have to find a mob that isn't powerful enough to kill your bot that only has 4% health remaining. It has to be strong enough to hit the bot at least once though. Kinda annoying, but nothing that major.