Microi SD card issues xFlytouch 1.9_88 v0.4 [RUDROID]

Hi,
I bought a generic 7" low power 256 RAM MID tablet
I rooted it with xFlytouch 1.9_88 v0.4 [RUDROID] (which is wonderful)
I use an 8 GB micro SD card
The issue that I am facing is :
when I leave the tablet on my table, and the screen turns off, in about 5 to 10 minutes it wakes up and makes a sound with a message (the SD card unexpectably removed), then goes back to sleep, this happens every 10 minutes.
when I unlock the device the cards installs back immediately, but then usually the Wifi is turned off and I need to manually turn it on

any Idea how I can fix that?

thanks

Dundroid

 

well you could go into setting and set the screen to never turn off

 

thanks, but not the answer I was looking for