It looks like your device get tired
Joking aside, I assume that memory is full. It may be up to your device, if it has less than 256MB RAM; or the problem is up to the NG itself (not well cr*ck*d, or bugs), or something else we can guess about.
Or, most probably, all factors.
Solution - try to tweak sys or there is no any.
Why don't you post that package here, with short description?
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