A lot of people are with the opinion that it is the release of Shortname feature that is causing Google My Business suspension. A lot of people tweeted the same. Here are a couple of screenshots.
However, the suspension issue started around June 12th and the Shortname feature was released around June 20th. So, there might be a possibility that the two are not related. Moreover, Google confirmed on 24th June that Google My Business Team is suffering from a backlog.
People out of fear are removing their shortnames. It needs to be noted that Google has made no official announcement regarding the same.