We submitted an original article in January this year to a Hindawi journal. In March, we received the request for major revisions. All points were easy to address. The reviewer asked for some additional data and some minor clarifications. We sent in the revised version about 5 days later. There was just one reviewer and we were convinced that there would be a fast decision. Notably, the journal has not published a single article after March 18. We inquired about the status and received a copy and paste "it is under review" reply. Per sé this is not uncommon but I know of a co-worker of mine who had a similar experience. He has a manuscript "under review" in the same journal where minor revisions were requested in early February. Still he is waiting for a reply.
What could we do if the journal becomes "inactive"? Contact the academic editor directly? One might argue that two months is not a long period but for minor revisions (e.g. some minor language corrections) it seems odd.