Did I damage my machine?

I bought a 2010 bw145d-40 bomag this spring. It has been working great. Last time I used it I notice the high speed travel was not working well. Slow and week seems to be labouring. It's only a little faster than the slow speed. I was reading through the manual and it said to only change speeds at a standstill. I was going from high to low while moving. Would doing this damage it causing the symptoms it has?

Thanks.

Did I damage my machine?