Vlan only visible through RMS

We have RUTXR1 router with 4 x Vlans monitoring a number of devices. (Vlan 72, 73, 74 and 75) we also have a couple of managed switches next to the router.

Everything works great but every so often one of the Vlans (Vlan 75) stops communicating through our scada platform.

All IPs on this Vlan are unreachable from any of the other 3 x Vlans.

However, we can view all the devices on Vlan 75 when we plug our laptop into any of the devices on the Vlan 75 network itself.

Also we can view ALL devices across our network via the Teltonica Remote Management System (RMS)

We have tried mutiple reboots and powercycles but it doesnt fix the issue then out the blue it just comes back on…its been happening for months now.

Does anyone have any idea why this is happening?

Im not very technical when it comes to networking so hopefully im explaining correctly.

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