little issue with cifs mount

I have noticed that a couple of devices of mine have problems with CIFS mouting.
These devices are in wireless client mode (Shibby 121 k24) and relay on another WAN/AP 3rd party router to connect to Internet. Cifs server is located remotely and reached via VPN, client running on the wireless client themselves.
After a bit of investigation I noticed that this CIFS mounting problem happens when the WAN/AP router is down and the wireless client e.g. reboots. It appears to me that only one...

little issue with cifs mount