APs disconnecting randomly from cnMaestro

Hello, for some time i have problems in my simple wifi networks consisting of various E510, E410 E502 APs.
Network is a simple router acting as a DHCP server plus gateway with directly connected APs. No special VLANs only guest portal login.
All the APs have assigned IP adress, i can ping and SSH to them, they work fine network-wise.
The problem is they randomly disconnect from cloud cnMaestro and seem to not be able to connect despite having connectivity to cloud.cambiumnetworks.com . Their IP, DNS, all seem to work fine (testing from inside the AP through SSH)
The weird thing is this happens in batches - 3 APs go down the same time and act the same, while others run fine. After a month or so others go down while the ones that were down suddenly appear online.
Please help me out what the hell is goin on with them

Since when this started? any changing in firmware cnMeastro?
What kind of release are you on for the APs? Can you configure a static IP addresses and DNS on the AP’s and switch and see if the disconnect notice goes away?

Hello,
I’ve been noticing the same issues with a group of APs in cnMeastro. The APs go offline in a rotational order. They are pingable from the gateway on the network, but you can see the devices drop offline in cnMaestro. A customer has reached out complaining about the WIFi not working as well. I’ve checked the IP to confirm on static and DNS on the APs appear to be configured the same as other AP groups that are not having issues. Currently the APs are on release 4.2.3.1-r9

@David_Hendree
If devices are in cloud, could you please invite me to the account for troubleshoot.
Thank you.