Not Yet!! Sorry
Gents, you provide very little information, so it is hard to suggest anything.
- is a single client affected while other PPPoE clients of the same PPPoE server work trouble-free, or is there no other client of that server, or are there many clients and all have the same problem?
- does the disconnect and re-connect happen all the time or once in a specific amount of time
Based on the answers, it may make sense to post the configurations of the client and server devices (
or rather to sniff at both devices in parallel and check whether packets sent from one of them really reach the other one.
A drawing of the network may also be helpful unless it is as simple as the PPPoE server being also a wireless AP and the PPPoE client being a wireless client of that AP.
Instead of writing novels, post /export hide-sensitive. Use find&replace in your favourite text editor to systematically replace all occurrences of each public IP address potentially identifying you by a distinctive pattern such as my.public.ip.1.