Got Reported

So I was reported recently due to being disconnected even after 5 minutes into game. My team reported me for this reason and this reason only, however it affected our team not the least as our team could've easily resolved me being gone. As being away for 5 minutes, you can tell I probably would need to catch up. I was against a Riven who had a significant amount of cs higher than me, and I was able to successfully hold against her for a long time. One team fight came up where our team was 4v5 and gave Riven a kill, which later my team blamed me for not being there. Should it be our team's fault we engage in a teamfight as 4 and not defend instead, as I was behind? When we were 4v5, our jg couldve easily compensated for top lane and our team stayed safe until I was back. Even though I was reported, can someone please tell me if this would be a bannable offense?