dehumidifier behavior ?

I recently bought a philips dehumidifier and i noticed the fan, which has three adjustable speeds, automatically adjusts itself to maximum even when in manual mode where the user is supposed to be able to set the settings manually. I'm wondering if this sounds like normal behavior. 

Also, with this particular model, I set the humidity target to 40% and sometimes I come back and it has reset itself to 60. Also in manual mode. 

With the first thing, I understand there may be a reason for the fan to increase in speed, maybe a way to keep from overheating or to maximize efficiency and move as much air while the coils are cool.  It seems odd that this is not explained in the user manual or that there are fan speed controls if they are going to be overriden, so I'm thinking it may just be a fault. 

The second thing, with the humidity setting changing itself definitely seems like a fault.