my commtest vb7 is being reset involuntary

 I have a problem with my VB7 commtest device. I've used it for 5 years but recently it has begun to reset involuntary and repeatedly. It does that till its battery is being discharged. The LED indicator of charging doesn't turn on while the device is being plugged. I changed its battery with our another device but it wasn't rectified, so I think its battery is OK.

 
i really appreciate any comments or suggestions that can help me to mend my device.
 
 

20180807_120344

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