Are they fireproof? As in accidently getting doused with a flammable product.
They're apparently robust with regard to being pushed or kicked, as long as the impact doesn't damage their exposed parts. But aside from that:
A strong RF/EM source (maybe a microwave transmitter) would likely disable it.
Fire would destroy it.
Two kids with baseball bats or pipes could probably take it down.
It'll have to have a LOT more mechanical and electromagnetic defenses before it's ready for field action.
And fire will remain a problem even if it's heavily shielded, and shielding will inhibit its dance moves considerably.