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I have updated the trb142 with suggested latest firmware but issue persists. I can send messages as expected but after about 50 messages the modem will not send any more. Now even after reboot it does not send.

This happened when on site and thats why I bought everything back to office.

I have no reliability with this device and the client is going mad. Where do I go from here..

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For this issue of yours could you make sure that the SMS package of the SIM card is not finished? What SMS commands or messages are you sending. And what response are you expecting from the router? If you are executing SMS Utilities command you can refer to this link: RUT955 SMS Utilities - Teltonika Networks Wiki (teltonika-networks.com) 

Let me know if the issue still persists.