Xbee3 can't receive by microPython after a few minutes

Hi, everyone.
I wanna connect some xbee3 by micro python without pc.
when My xbee3 connected AC adapter(didn’t connect PC),it couldn’t receive after a few minutes.
But, it was always running program when it connected AC adapter.(I checked by LED)
And, the xbee3 did communication normally when they connected pc(pycharm) or it reinsert AC adapter.
I want to know how to crash problem.
I thank you in advance for your reply.

Are you using the same board in both cases?

yes,I am. i use this one(https://akizukidenshi.com/catalog/g/gK-06188/).
So, supplied voltage is both 3.3V.

That is an unknown board. I would suggest you try using the XBIB-CU-TH instead.

Thanks you. I try the XBIB-CU-TH.