I have received this message on my Hydros Wave engine when I lowered the power on my return pumps and they froze up. There's a set minimum when you configure the pumps, just like the Platform on the 2k/4k controller, so in theory, they would still run at 1%. In the case of my 2k, it does, but the on RODC pumps on the big tank, they don't and I get the message.
So, review the pump settings. Perhaps raising the min power would keep it from locking up.
My only issue with my 2k is that it often looses it's Wifi connection. Sometimes it gets it back, other times it requires a re-boot. Could be a location issue though.