Screen flickering

[penguin]

Good morning:

I received my new HP Prime a few days ago. I haven't had enough time to review it thoroughly yet. However , I've already noticed an annoying behavior on the screen. Looks like that the screen flickers sometimes. There are some scenarios where you can reproduce this issue. For instance, if you type on the keyboard to enter an expression, some tiny horizontal lines flicker along the screen. This becomes more evident when the history has a lot of text. If You type in the command line on a fresh screen (after clearing the history) there's no flickering at all, or at least it is not visible because the screen is blank. To me, it appears to be something related with the screen refreshing. Somebody told me this is because the system updates directly the screen without using double buffering or so.

So I'm not sure if this means the unit is defective or it's 'usual' behavior because of a not fully debugged design.
I wonder if other users are suffering the same issue.
I'd be grateful if I receive some feedback from users using HP Prime before calling HP for a return.

Details of the calculator:

Software version: 2015 6 17 (8151)
Hardware version: C
CAS Version: 1.1.2-11
Serial number: 4CY4220922
Operating system: V0.037.526

Help Edition: 06 2014

Thanks in advance.