You are saying the house looses power but have you confirmed the whole house is losing power or is it just specific receptacles?

Your equipment is rebooting but that only signifies that one phase of the service is dropping. You need to place something to monitor both phases/the other phase to see if this is the whole house or only 1 phase.

As an electrical contractor we have seen a few things like this.

1. The phase lug is coming loose either at the electrical panel OR at the Meter base. It is safe to tighten them down while live BUT I would NOT RECOMMEND this as those lugs are not fused and could easily kill you with a slip of a hand/tool

2. There is an issue with the wire from the meter base to the house. We ran into this a couple weeks ago where a customer lost power to their shop. Wire was installed for years (underground) without issue and after a big rain about a month ago power to his shop stopped. All connections were fine at both the meter AND his Shop but there is an issue with the wire underground somewhere. Cannot obtain continuity across any of the wires and somehow there wasn't enough current to ground to trip the fuse on the transformer.

This is definitely something an electrician needs to look into but for monitoring purposes on your end you need to find something on the opposite phase of the rack to determine if it is the whole house or 1/2 the house.