Regular freezes in all Xbee's at the same time.

I am using XBee S6B’s to send data to the local server from 5 devices simultaneously. Experienced regular freezes in Xbee(even the Data is sent from the Seeduino stalker) for 5 minutes for each upcoming 20 minutes time interval. All Xbees stop and start at approximately same time. Any solutions to make them work continuously?

What baud rate are you running them at?

What are you mounting the radios on?

What settings have been changed from their default values?

Can you reproduce the issue using XCTU?