I don't know what causes this but it is extremely annoying.
On my pfSense box it constantly shows that my AH connection is dying, sometimes shows it's completely offline even if I am connected fine and can use the line. It ONLY does this on my Afrihost account and been starting this around the time when everything went belly up a few weeks ago.
It doesn't seem to affect my speed or latency though but it's huge issue at my office because we're load balancing with two lines and it won't use the AH line because it's showing that it's down. I could fix this by disabling monitoring but then I wouldn't know when the line is really down and it would break everything if it really did go down.
I see this constantly in my quality graphs, this is for the last 8 hours:
And for a few weeks:
This happens on both my home and office lines, and happens only on the AH account.
I cancelled this account now and moving to another ISP, but maybe someone should look into this as there may be something deeper at play here.