Need Help Troubleshooting 1st IP Camera Install

I installed 5 IP outdoor cameras 4 months ago at a storage facility and worked fine until a couple of weeks ago. 4 of the cameras are mounted to two semi trailers that were converted into an office and a storage unit. A metal pole was attached to the trailers and the cameras mounted to the poles. These cameras are about 100' from the DVR. The fifth camera is mounted to a metal fence pole about 250' from the DVR. Direct burial CAT5e cable was used on all cameras. Two of the cameras mounted on the same trailer frequently show "video loss" then "connecting. The camera that is 250' away is dead and the RJ45 jack show a burn mark. Ends were replaced on the cameras that are going in and out and the problem still exists. PoE switch was replaced so ta is not the problem.

Any feed back would be appreciated.

Thank you

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