Hello, friend!
Can you provide the device model?
You are advised to collect device information first because the problem description is unclear.
The procedure is as follows:
1. Please help to confirm below questions
1) The device connected with Velop always work fine?
2) How often does the issue happens?
2. Prepare two PC,PC1 connect to LAN1 port,PC2 connect to LAN2 port,and both PC1 and PC2 please install wireshark
3. PC1 telnet to the ONT,execute below command:(default account:root/admin or root/adminHW)
WAP> set ethportmirror sourceport 10 destport 1 mirrordate 2 enable 1
////destport 1 means the capture PC connect to ONT by LAN1 port
4. Open wireshark on PC1 and PC2,and start capture
5. PC2 ping 8.8.8.8,Wait until the ping request timeout
6. Stop the capture and save the packet
WAP> set ethportmirror sourceport 10 destport 1 mirrordate 2 enable 0
7. Collect the ONT configuration file and fault info


Thanks!