>>Depending on how the NAS is configured
>>
>>(1) After 15/30 minute of inactivity it goes into sleep mode
>>Disks stop spinning and are switched off. The NAS is in standby
>>
>>(2) After a longer time of inactivity it goes into deep sleep - it switches itself off.
>>You have to power it on if you need it again
>>
>>
>>What you may have experienced is case (1). It has to start the disks and wait until they are ready
>
>Very interesting, thanks for the information, the NAS is shared with other products which are using it on a permanent basis. But, our shares, for our own product, is not presently. Based on your experience, is point 1 still applicable in this scenario? If yes, that would mean this situation is NAS share drive level and not the entire NAS itself.

I don't know. Depends on the definition of 'permanent basis'

You must be able to connect to the NAS with internet explorer and look at its configuration ( or ask someone to do it for you)