KVD21 gateway dropping LAN connection or cell connection?

Yes. All mesh connected devices communicate each other no problems up to the point to KVD21. That is why I am using laptop to directly connect gateway to validate there is no access to internet. Yes. The default gateway setting with directly connecting to KVD21 is on 192.168.12.1. After rebooting, it is working as expected. My point is: the issue is within gateway, where it is an isolated case of bad hardware, or it is some wide spread software or functionality issue that other user had experienced. I am a network engineer myself, but there is no option for me to dive into KVD21 itself to do further monitoring or logging etc.