Gear Pops /slips/ jumps out to neutral

[sant_ashu]

Hello Guys,
I had a problem yesterday while i was going on dual carriageway @50-60mph
when my fifth gear pops out to neutral. I pressed the clutch and engaged it again. And again after couple of mins it pops out again. And then i engaged it again and it did not pops out.
I had earlier an issue week or 2 before when my 4th gear was popping out to neutral. and it was maily duing city driving. And i thought it could be due to gear oil not being hot enough. As the Blue engine light was still on.


there are few links i found about the issue:
http://www.wcengineering.com/articles/popout.html
http://wiki.answers.com/Q/Why_would_...ip_out_of_gear
as these are more general ones not specific to yaris so

I just want to know if any yaris owner had this issue before and what was the reason, or how did they sort that out.
Cheers