Well not really "stealing" but let me tell you...
My wife plays the game. She is a miner. She gets frustrated when people (WHILE she is mining) come up and takes/steal the node.
She says it almost happens "instantly" after she pockets the ore. Are they "spamming" the mine key or is there another trick?
The only suggestion I have had for her is to not to loot. Keep the loot box open and wait for "asshat" to leave. Of course that bites into her playtime.
Anyone have any other suggestions?