CLICKING/CRACKING NOISE WHEN SCROLLING: NORMAL?

Hi everyone!

Like this topic is titled,
I have clicking/cracking audio when I scroll the screen
or when a video is playing
or when something happen on the screen
(even when I navigate in my computer folders
, zoom or search for vst in reaper).

Of course, when I increase the audio samples on the external audio card to 512 samples,
the problem is almost clear.

I just wonder if this problem is normal
or if I have an unusual issue.


• My computer:
Intel 4 core i5 3.10Ghz
RAM 8 Go

• My OS:
Windows 7 64bits

• My audio card:
AKAI EIE Pro (last stable driver)

• My video card:
Nvidia GeForce GTX 970

• Versions of Reaper with bug:
v5.24/x64
v5.25/x64


Is it due to some parameters of Reaper?
Or interference in my system?
Or is it a normal situation?

By advance, thank you very much for your response!