Problem with the printer, stops randomly printing - please help

Hello everyone,

I own an EZT T1 Delta 3D printer for 2 month. It worked fine and I didn't have any problem with it, but a few weeks ago it started to stop mid print.
It prints like everything is fine, but sometimes it stops printing and starts to home the print head at the top of the printer. Since that it happens 90% of my prints and I can't finish any print cause it always stops around halfway (sometimes 5 minutes after start).

I tried to factory reset the printer, re install the Slicer (I use Cura 15.02.1 it came with the printer, but the newer version of Cura don't work on this printer), brought a new SD card and reader, try to format the SD card before usage, but none of these helped me!

If you had a similar issue or know how to find the problem, any help would be much appreciated!

Thank you in advance!