Glad to know that you no longer encounter any problem in routine operation especially when you access EQ, I didn't have that problem so so far we didn't receive any reporting stating that the player will restart when using EQ. Can't think of any reason that lead to the problem, especially when the problem suddenly goes away several days later. By the way, did you changed your TF card or music content in past few days.
Regarding your volume control problem, if you are using any protective case, take out the N3Pro, put it on table and turn the volume. If you still run into difficult with the volume, I suggest you get in touch with your dealer.