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@lynx I would hack out as much of the cracking grout as possible and get a good wide joint grout and start again - BAL and Mapei both do wide joint grouts, they tend to be the industry best so I would stick with them.
Just make sure you mix it well by hand and stick to the ratios they advise, work it into the joint for as long as you can, by going over it with your grouting float to get any air out of the joints which could cause it to go off quicker than intended. Best of luck mate
andos
The issue is that I already have the problem with the mapei grout cracking and coming out, Mapei gave the reason that it happened as the grout was not mechanically mixed.
Will look in to the bal. Any other...