2007 ZX10 Key problem.

Hey guys after not riding for a while decided to finally take the bike out for a run in the nasho with a mate after stopping at bald hill for a chat went to get back on the bike and start it but she wouldnt start
.Noticed there was a pic of a key flashing on the screen tried a few times with it turning over but not firing and decided to leave it for a bit before going to get the trailer...Decided to try one last time and the flashing key was gone and she started....Is this an issue with the key or the immobilizer 

