Hello,
you have the same problem as this user here is the link to the subject if you are interested
To correct the problem, you must update your TRB500 to Firmware RG501QEUAAR12A10M4G_04.200.04.200 which includes the patch,
unfortunately the only version I have is an unofficial version that was scraped from the TRB500’s internet memory in raw format and which then had to be modified to match the TRB500 update format,
I cannot provide it to you since it is an unofficial firmware and which may result in the loss of the warranty of your TRB500
unfortunately in some countries the fix does not work the perfect example in France where I currently reside and the firmware RG501QEUAAR12A10M4G_04.200.04.200 does not solve the problem,
while waiting to get a response from Teltonika support I am helping users who have the same problem,
Best regards,