@re0
Was using zyxel modem when increase occurred. Only happened a couple of days ago. Been using it for about 2 weeks.
Left Smart Hub on circuit for about first week. Then got too curious.
I have tried a couple of different modems in since that time, another vmg8924, which had lower sync rate (?) and a vmg3925 in modem only mode with an Edgerouter X behind, trying to get ipv6 to work (successfully). But last week reverted to principle vmg8924. Then this happened.
I suppose this could all be my fault, however, did try to leave half hour between modem changes so as not to affect DLM.
Anyway, thanks for your interest.
Terry