Shuffle play now only plays the same 5 or so songs out of my entire library and then stops.

I am using iTunes 12.1.2.27 on a PC runnoing Win 8.

I used to be able to select shuffle and just let iTunes work its way through my entire library.

Now it seems to play the same five sopngs and then stops (library is >1,000 songs).

Under CONTROLS on the menu, SHUFFLEis on and set to SONGS

I am in MY MUSIC, select play and get the same five songs and it then stops......

It might have started when I had to restore my PC and copy my library back onto the hard drive but not sure.

Any suggestions?

Many thanks