Worth Fixing 27" Panasonic CT-27G12C???

My tv is about 7yrs old. When it works, it works great.
My problem is that after 15min to 2hrs I hear a click sound and the tv shuts off and then comes back on if you bang the tv or jump on the floor. lol.
Anyhow, I never have to power the tv back on. It comes on itself after awhile.
Is this a simple issue worth gettting fixed or would it be best to purchase a new tv?? Any input would be appreciated.

J.Wright
September 2004