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Reliability ios a ranking factor, if you offline once,, you will be ok, but if the come back time after time you will drop in rank and will have to be relaible for a long time to regain trust, if you are offline long enouth, you will be de-indexed

Simon is correct, SE's see this as 2 different sites, you are splitting your rank. 301 one to the other and you should get a boost over the next few weeks

Hi Alan. Yes, our software is Ok. Im will try to move the hosting, maybe that move bring us back our SERP. Thanks