I need help in understanding a product failure.

I have now had two customers with similar failures in my POE fuse product.  The 
fuses are blowing.  
So far it is limited to the fuses on pins 4/5.

One customer is using:
UBNT 5AC Prism Gen 2 radio, Mikrotik 411 boards, using both poes and netonix as 
the power supply.

What pins and polarities does that radio use for POE?  How much current?

I may need higher rated fuses or slower fuses.  But I can only go so high 
before it is not protecting Netonix thus becoming an expensive CAT5 splice.  

My ideas so far:

I need a slower reacting fuse.

I need a higher amp rating fuse.  (not sure how high I can go and still protect 
Netonix)

Some loads have unanticipated currents on those wires.

Plugging in when powered may cause a connection sequence problem where if pin 4 
makes contact first the whole load will go through that wire and blow that fuse.

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