2001 Hyundai Santa Fe turno off, then after 2 hours on

Electrical problem
2001 Hyundai Santa Fe 4 cyl Two Wheel Drive Manual

dear all
I have 2001 santa fe.
suddenly it turns off and does not start again but you can hear the starter working good but the motor does not work.
after 2 hours it will start normally.
Some times it turn off after on 2 minutes ( it is cold , not heat problem ).
One electrician checked it and not find problem
pls advise.
Thanks
[email protected]
fareez