Wheel fell out

I cycled to Tesco last night and when I went to lock my bike up and lifted my bike up a little to put it in position to lock it the rear wheel fell out.
I got the wheel back in and cycled home ok,but noticed play in the back wheel that hadn't been there before to my knowledge.
I had taken the bike to a LBS this week as I thought my brakes needed bledding and the wheel was slightly out of true,so I gave him new pads to fit,on leaving the shop he said that he would see if all of those things did need doing,and I was pleased and said I was a full time carer so that would be great as I haven't got a lot of money,so I was so pleased when on collecting that he said the wheel was less than 2mm out of true so didn't need doing and that the brakes didn't need bleeding either.
That leads me to wondering why the rear wheel suddenly has play in what I assume is the cones and the wheel fell out of the drop outs a few days after he did the work.
I don't think there is any point in taking it back to that chap as I can't prove it's anything to do with him,I think I'm just going to book it in for a £60 service with a guy that has a very good reputation in the next town to me.
Has anyone any thoughts on what has happened?
I got the wheel back in and cycled home ok,but noticed play in the back wheel that hadn't been there before to my knowledge.
I had taken the bike to a LBS this week as I thought my brakes needed bledding and the wheel was slightly out of true,so I gave him new pads to fit,on leaving the shop he said that he would see if all of those things did need doing,and I was pleased and said I was a full time carer so that would be great as I haven't got a lot of money,so I was so pleased when on collecting that he said the wheel was less than 2mm out of true so didn't need doing and that the brakes didn't need bleeding either.
That leads me to wondering why the rear wheel suddenly has play in what I assume is the cones and the wheel fell out of the drop outs a few days after he did the work.
I don't think there is any point in taking it back to that chap as I can't prove it's anything to do with him,I think I'm just going to book it in for a £60 service with a guy that has a very good reputation in the next town to me.
Has anyone any thoughts on what has happened?
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And truing a wheel is very easy if you have the nipple key and access to youtube.
I know I've done a 3 mile descent and then noticed my front QR was undone. And this was on a custom frame with no 'lawyers lips' - I had to stop quite gently and tighten it up. No idea how that happened but it was in the middle of a 60 mile ride and all was well when I left home.
Do you know how to use QR's ?
https://www.sustrans.org.uk/our-blog/get-active/2019/everyday-walking-and-cycling/the-m-check-for-your-bike-in-11-steps/