I have 80 sites (6 is multi-sites) Traffic on 60 is hardly

Hi
I have 80 sites (6 is multi-sites)

Traffic on 60 is hardly anything and the other average 100 Uniq people per day - nothing out of the average - average 30Gib per month.

I constantly have issues with sites that is down and now its apparently because of RAM. Just upgraded from reseller to my own dedicated Cloud Server (1CPU, 2G of Ram) and get told to upgrade with another 2G or Ram.

Does this sounds correct?

Two weeks the sites run 100% and then suddenly I have these issues.