in no particular order, and with likely missing causes, I thought of
1) DOA (Stillborn)
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******** ** ** ***** ******* ** IPVM ******/******* ********** ****.
* ***** * ***** ***9) ********** ******; surges and spikes caused by lightning strikes particularly when it rains a lot. Such surges "burn" the camera´s or DVR recorders´electronic circuit board components easily. Happens a lot to outdoor cameras installed in metal poles with no nearby lightning rods in the area to divert lightning harmlessly into the ground.
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**** **** ****** ********** ********** ****** or **** ** ******* ** ***** proposals: ****** *** ********** * ***** protectors (*** **** ***, *** ***: one ****** *** ****** ** *** pole, *** ******* ****** *** *** Switch ** *** **** ** ** cameras / ***** *** **** *** in *** **** ** ****** *******) so **** **** ********** ***** ********** can ****** *** ****** *** ********* themselves ******* ** ******** * ****** more ********* ******, *** ****** ** DVR/NVR.
**** ** ******** ******** ** *** radio ****************** ****, ***** ******** ******* base ******** *** ******** *** ******* everyday ** ********* ******* ****** *** weather: