Gymnetis thula Not coming out as often?

I got some harlequin flower beetles earlier this summer and they had been very active up until the last few days. I added some fresh bedding and now they’re staying under the substrate most of the time. Did I do something wrong with adding new bedding or do they go into a dormant phase? I hope it’s not the end of their life cycle I’ve really enjoyed them! 

 
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