WR21 looses contact with RWS200(LAN 0)

We have approximately 56 WR-21 that we maintain, they connect to the Vaisala RWS200 as part of a weather system. intermittently I loose the connection between the WR-21 and the RWS200, random sites, repeats weekly, daily, monthly. Rebooting the WR-21 cures the problem for a period of time, but does not cure it. What could be causing this problem and what is a cure?

Hi and welcome to Digi Forums.

There could be many reasons for a device losing connection and this would probably need further investigation to provide an answer.
I would however ensure that you have configured Surelink to test and recover from any cellular issues: http://ftp1.digi.com/support/documentation/AN07_TPort_Cell_Prob_Det_and_Rec_using_SureLinkWiz.pdf

I would also make sure that your device is using the latest firmware version: https://www.digi.com/support/productdetail?pid=5499&type=firmware

For any further help or investigation on that issue, please review our support options on our website: https://www.digi.com/support and mail our support team at tech.support@digi.com.

Thank you

Digi Technical Support Engineer