I cannot receive UDP packets

I’m investigating the firmware update for WP7605(R17).
I am sending UDP packets, but I cannot receive them for about 10 minutes.
Please tell me what the cause might be.
Also, the following messages are frequently output. Please check whether they are related.

user.warn kernel: [  605.648477] PSM: Modem oprt mode - 6

user.warn kernel: [  606.544747] PSM: Modem oprt mode - 0

How about tcp packet?

How about ping packet?

probably you need to first verify if the data connection is OK.