Random Outage followed by Memory Spikes

Hi. I'm not sure if this is a Railway issue, but never seen anything like it. On Sunday Early Morning (3:30 British Time), my app randomly stopped ("crashed") without any logs suggesting why. Since I got it back online at 8am British Time (by "redeploy"ing the current version of the project), I've seen a massive spike in Memory Usage without any clear reason why. Any suggestions as to why this could be?