I have had this issue on many Peplink Balance Ones.
I can usually resolve with using 18.104.22.168 22.214.171.124 and /or adjusting the interface speeds or switching to HTTP healthcheck but I cannot seem to resolve it on this particular site.
We have a Spectrum Cable with Static IP
350 Mg/150 Mg Coax.
Constantly going in and out.
I have issue at other sites but have Fiber as secondary WAN and doesn’t seem to happen as often so it’s not as noticeable. We have no 2nd access at this site so it is causing major issues.
I have read every post with same issue and tried all fixes I have seen.