Ex120-5 extremely slow travel except when using another movement.

I was using my 120 today for maybe 15-20 minutes, when suddenly it decided that it didn't want to move very quickly. Unless I was using a another movement; such as boom up/down bucket curl, rotating, etc. It doesn't matter what travel mode is selected. The engine sounds like there is no load on it, when it is traveling. Any ideas?

I tried searching for solutions, but came up empty. However, in the back of my brain I think I remember reading about a spool getting something in it, that...

Ex120-5 extremely slow travel except when using another movement.

Ex120-5 extremely slow travel except when using another movement.