Sony cdp - c445 cd multi player (5)

I am obviously doing something wrong here. I posted a question about 4 hours ago and don't know how to find it.
I checked my profile and found no indication that I had posted.

I indicated that we had "tiny hands" visitors recently and that our cd ...multi 5 disc is now not working properly. We are all adults here in the household.
In any event my bro gave it to us when he moved without giving a manual. We have encountered no problems to date.

What happens now is when we try to play our 5 discs and usually listen to each disc all in order and each song in order there is a "mess".

As an example I press Disc 3 Song 1 and there is a whirring shuffling sound inside and the Disc moves to 5 and starts playing Song 3 as an example and I attempt to enter Disc 3 and Song 1 again and this continues to persist.
When the song finishes I then enter another Disc number and song number and try again and then sometimes it will go to say Disc 5 song 6 and even Repeat that song.

All we have ever done here is manual selection of discs and songs and had no issues.
We have never programmed, shuffled etc. as had no manual and would not know what we are doing. We were satisfied with what we did.

It would be great to have the manual, however Googling brought out nothing.
I tried shutting off the power bar for the stereo system and counting to 10 which sometimes helps "Vcr" problems and turned the power bar back on and the problem was still there.
We are putting up our Christmas tree and would like to get the cd player working properly.
I genuinely hope that there is some one here that can lend assistance or point to where we may find a manual.
Kind Regards, with Great Appreciation for your time.
Frustrated new member !!!!