I experience very frequent disconnects of Ethernet link on Strong 1200. Up to 9 disconnects in a half an hour. Strangely, the frequency of disconnects increase from 08:00 to 12:00 and decrease from 12:00 to 18:00. Each disconnect lasts for 10-25 seconds.
This problem emerged when I used OpenWrt 19.07.7 r11306-c4a6851c72. I have tried to upgrade to the latest snapshot, but nothing changed.
Other strange thing is that most of disconnects occur on a connection with ISP. When I plug the cable from ISP into other devices, there are no such disconnects. I have tried to reconfigure switch in the Strong 1200 router to plug the ISP cable into another port, but it did not change anything - the disconnects still occur.
There are also a few (1-2 per day) disconnects on Ethernet connections between this router and other devices.
What I am trying to figure out here is whether the problem is in the firmware, or is it just my device is broken. Does anyone have the same problem with this device?