some suggestions
If you really want to debug this, here are some ideas.
First I would find out if it is really sleep mode which is playing up, and not hibernate. So hibernate the machine explicitly and check if the problem does then occur.
If the problem is indeed with sleep mode ONLY, then you can use powercfg on an elevated CMD prompt to configure STANDBYIDLE to 0 (i.e. no sleep). System will then only go to hibernate.
Alternatively, the issue might be with hibernate, so you can then disable that instead.
(I understand you could do the same thing from the group policy editor but that is unavailable on my lowly Home SKU.)
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