2 rigs same pool, same wallet, causing reboots

[andydis]

So I'm using my rigs to crack passwords using my site www.hashcat.online

when they are not cracking passwords they are set to mine zcash at fly pool using the same Wallet,

However when both rigs are mining the hashrates go up and down like crazy and both rigs reboot alot, almost like they are fighting each other.

When i mine on the same pool using different wallets, they are stable.

Anybody seen anything like this?