Coping tile came off - Suggestions

Hi
I have a coping tile that has come completely loose, and the grout in between the next tile has completely cracked; tbh i've been eyeing it a while as it seemed loose as the grout had a large crack all the way through it. I also see this happening to another tile on the other side of the pool. Here is my question

1.) Why is this happening? i presume a combination of rain + heat (?) we also have a katch a kid net, that hooks to the coping and is pretty tight as we keep the net on all the time; as we have a three year old in the house so need the security for him.
2.) What should i do to fix it, is this a DIY job, or can a regular "pool guy" fix this; as i dont have one and manage my own pool... If you have tutorials you can guide me to, i'd be open to doing myself as i am semi-handy.

Thanks in advance, pic attached
 

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Coping stone comes off for various reasons. How old is the pool?

If it is just the one tile I would suggest to chip off the old mortar mix some new mortar and re-set that tile. I would do this myself but if you don't feel comfortable, bring in a pro. I certainly wouldn't trust the pool boy.
 
Also the fact that it is the last tile and also has an overhang could be contributing factors. The last tile gets the driest mortar. Travertine should be "back-buttered" but I see no evidence in that mortar of the holes in the travertine making me think they did not do this. The overhang would add extra stresses on that tile due to people sitting on it and such.
 
I just got a quote for $400 for one tile replacement; is this reasonable, seems awfully high to me.
It would cost you about $20 to do it yourself and isn’t hard.

1. Get a hammer and chisel to remove the old mortar. Careful not to bust any tile loose.

2. Clean off the area really well, compressed air will help.

3. Go buy a quart of tile mortar and a tile trowel

4. Mix up the mortar and spread it on the back of the tile and down on the bedding where it came loose. Nice thick amount. Check YouTube for examples of tile mortar.

5. Lay tile down the tile and get it even with the surrounding tiles and then don’t touch it.

6. Come back the next day and grout the gap. YouTube is helpful for that as well.
 
I had to re-set some of mine too when I bought the place. It was pretty simple, did it just as Bperry described. They've been solid for the past year. I bought a full bag of Type S mortar, did all the loose stone as well as patched up some corner cracks and messy spots on the edge of the slab. Wasn't that tough once I got the hang of it. Nice thing is if you mess up, just hose it all off before it sets and start over.
 
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