If Gbot sees 404's when it comes calling, it will try again at a later date. Only if it sees repeated 404's will your ranking suffer - and then it can be restoed with stable hosting in place
"the site is down for a few hours a week"
This should make NO difference, providing they DO get to see your site at some point. However, any downtime is bad for a variety of reasons - look into more robust hosting
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