Bathroom tiles cracked around 78cm

[TooMuchHassle]

New bathroom suite installed about 9 months ago by a well rated bathroom shop. The shower has rarely been used as we use the ensuite. There is a vertical crack across 3 tiles which seem to have sunk inwards. Cracks are around the 75-78cm mark which is where the old shower enclosure would have been attached the stud wall before it was taken away and replaced.

 

[foxhole]

Could be poorly prepared surface before tiling give the installers a call see what they have to say.
Did they tile onto plasterboard without tanking or further preparation?

 

[foxhole]

Edit

 

[TooMuchHassle]

Could be poorly prepared surface before tiling give the installers a call see what they have to say.
Did they tile onto plasterboard without tanking or further preparation?

I wouldn't know to be honest. Do you think it's the backing adhesive or boards? Should they just replace broken tiles or remove that section?

 

[foxhole]

Tiles crack with movement so wall behind cannot be stable .

 

[TooMuchHassle]

What I thought

Tiles crack with movement so wall behind cannot be stable .

What I thought as it's around the 78cm mark where the old shower would have attached to the wall and previous tiles ended. Just noticed tiles that have no crack as yet look to be imploding along that length.

Should they be removing all the tiles on that section, securing the backing before retiring?

 

[foxhole]

What I thought

What I thought as it's around the 78cm mark where the old shower would have attached to the wall and previous tiles ended. Just noticed tiles that have no crack as yet look to be imploding along that length.

Should they be removing all the tiles on that section, securing the backing before retiring?

Definitely need removing but solution depends what you find