Without knowing more details, anything here is going to be no more than pointless speculation.
Zazoo, there are literally thousands of factors that could have affected this sad incident. One of the pilots could have had a toothache or could have sneezed at just the wrong moment. There may have been some minor unserviceability on the aircraft. They could have had a bird strike in the engine followed by another on the windscreen just as they were sorting out the first one, etc. etc.
Hot and high certainly affects an aircraft's performance. I know that the 1-11 is a pig to fly (I've tried, and prefer it marginally to the F27 - but only marginally). There have also in the past been accusations that the aviation infrastructure in Nigeria is not that all it could be.
As I say, all is useless speculation. If there is a website where some form of official report into the incident is available, perhaps you could point us at it?