503 gateway timeout for `take survey` link
I can't get to the survey.
Should be better now? Sometimes the server gets overloaded, sorry…
Yep! Got one issue after submitting.

The take survey button just gets stuck loading. Doesn't lead to survey at all. I'm assuming it's related to this issue
Sorry, server needed another restart…
Setup cron job for a few times a day?
Seems to be broken again.

@SachaG Any chance you have log files to narrow down the reason the survey keeps going offline? Is it truly being overloaded or is there another possible issue? If it is being overloaded I would say @j4w8n has the right idea to run a cron job to restart nginx at lowest trafficked times for the site.
I do think it's overload or some kind of memory leak made worse by the high traffic:
I set up a job locally on my own laptop to reboot the server but that wasn't very reliable, so I'll set up an actual cronjob.