what species are the crickets, are the the old brown crickets or are they silents?
browns, the common house cricket, are a bit volitile when they have a change in temperature, i reconmend warming them up very slowly dont keep them cold.
if they are silents then im not sure because they are usually hardier
pluss find out how old they are? are they adults? or babys, how long have they been in the shop for.
what do you feed them etc.