Don't Connect Xbee pro

Dear
Long to contact you. Wish all's been running well.
I bought 2 Xbee pro module from you long ago. I have test transmission for some time, and it was in good condition. However, recently, I suddenly could not connect any more. I can not understand why so.
I am very grateful if you can give me some typical errors and solutions to them.  It is extremely neccessary now because I am in deadline of my project.
I am looking forward to hearing from you.
Thanks and best regards.

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