Flint - site-to-site breaks: Device XXX LAN IP or routes changed, stop and then start network to take effect

[mave]

Hi,
I’m using 2 Flint GL-AX1800 (call it like “01” and “02”) at different locations, connected site-to-site (goodcloud.xyz).
Before updating to 4.4.60 sometimes this connections was dead. Restarting on goodcloud was successfull. Can’t say why this site-to-site failed sometimes.
After update to 4.4.60 site-to-site connection fails daily with this message on goodcloud:

Device 02 LAN IP or routes changed, stop and then start network to take effect.

On device 01 nothing was changed, no configuration items. Only: nightly WLAN ist switched off automatically. One day a week at 03.00 PM it takes a job to reboot.
What could cause such a message and changing?

[shivadow]

Are they both on the same physical network, like one upstairs and one downstairs or no?

[mave]

Are they both on the same physical network, like one upstairs and one downstairs or no?

No, different locations (next village). Both Flints create there own VDSL-connection with public IP.

Today ca. 03:00 PM: Peng, site-to-site breaks … ;-((( (like every night)