Network cabling that has not been installed properly may result in various communications issues. Even minor problems such as a connector that has not been terminated properly can prevent Power over Ethernet from performing well.
See to it that you use appropriate wiring patterns which are T568a and T568b. Refrain from bringing together T568a and T568b in the same cable. And always use premium quality Cat6 or Cat5e cables. We prefer solid over stranded wire.