Hiveon on S9 jumps offline/online but asic doesn't stop mining

One of my S9 with hiveon firmware send notifications to telegram that it’s offline, in a couple of minutes notification that it’s online. It might happen about 10 times a day.
But when I check miner status directly from browser it works fine and it’s not offline. And the pool doesn’t show that it was offline.
So there is definitely a trouble with hiveon somehow saying that the miner is offline or online. What might be the problem. It worked fine before and I didn’t change anything. I tried updating the hiveon firmware and it didn’t help.