You need to put in place processes that scale. Your current support system doesn't seem like it's scaling well (based on what little context you provided us).

You need to put in place processes that scale. Your current support system doesn't seem like it's scaling well (based on what little context you provided us). Do the ROI calculations and figure out if you need to hire more. If you can't hire more then you can experiment with a distributed rotational responsibility for that task (Increase pay of your team if needed). You can put guard rails around the unpredictable.