Chainsaws

I have a Husquvarna 445 thats 2 years and 3 months old,warranty is about up and I have already had it in the shop for leaking all the bar oil in the case when I put it up.I was on here a month ago with hard starting when warm,cold start is good so I changed the plug and it got some better.I cleaned bar,sharpened chain,changed air filter and cleaned out side cover,cut with it one time and now it has poured all the bar oil out again.What keeps causing this and if I get it fixed again and it happens out of warranty,how expensive and hard is it to repair,wonder if I need to sell before I have more problems.Please e-mail me at kayak316@ymail.com