Your comments

There are a few more machines in different locations with the same issue, I could check a few of them and they are using LTE connection.

Normally the network is: PC -> router -> Lan or WIFI or LTE modem, the PC we use is a NUC intel and the router is the Mikrotik. and for the LTE is the Cradlepoint devices, for the WIFI we just change the config on the router.