It shouldn't really cause any problems that you keep it until it revolts. It's not in that town that the reform markers are, they're put in all the carthaginian towns so you'll need to remove the markers from those if that is the cause. However, there are a lot of other markers down in Terhazza that could make it be too many buildings combined with the regular buildings.
Edit: The problem here is, it's usually a crash that occurs when there becomes too many buildings, not a freeze. The easiest way to get past this problem is to revert to an older savegame I think.
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