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 ?