D-Link DWR-932 mobile router changes its config randomly

I recently acquired a D-Link DWR-932 mobile router 4G/LTE
I configured it and it works fine, I can when I need and am travelling connect my portable PC to the Internet via that small box.
But from time to time, the access to the Internet setting of the D-Link box is disabled without any intervention of me !
It happened already 4 times in the last 3 weeks.
How can I fix this ?
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LeTayAsked:
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JohnBusiness Consultant (Owner)Commented:
I have a HUAWEI USB internet stick.  Upgrading firmware is all you can do with these devices, so try that.
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