My bike (2012 ninja 250) went down last weekend. I had to let it sit for about 15-20 minutes before it started back up. Ever since then it seems like I have to hold the starter for a bit longer than normal before it fires up, even with the recent warm weather (20 degrees+). Before my fall, the bike started like a champ, even around 0-5 degrees outside. Any ideas as to what may have caused this?