TRB140 dropped off RMS will not return

I have had a TRB 140 drop off and restore to RMS, and ended up offline. The unit was still sending dta form the IP devices connected but would not come back onto RMS.
Replaced unit with another one - Now after 2 weeks same issues again, unit is now off line RMS and will not respond to SMS commands.
However the dta from the system is still being transmitted to host as normal.
Any ideas ??
Thanks

Hello,

I have sent you a form to fill out via your email. Please fill it out and include the serial number of your device for further troubleshooting. Use ticket ID 5440 when filling out the form.
Thank you!

Best regards,

I have not heard back since I filled out the form- HAs it been received OK ?