Thank you for your response!
I've flushed the PageSpeed cache, and disabled the Bitnami banner. Everything seems to be running smoothly now, so I will give it a few days and see if it's stable.
Regarding the errors you are seeing with the Apache
error_log, is there anything specific I should look for when I review it in a couple days?
On the disk space issue, we are currently using ~8GB of 100GB according to
df, which seems insignificant to me. I will have to contact our support agent to confirm if they were recommending increasing our drive capacity, or possibly our allowed requests per hour - or whatever metric they use to bill for server output.
I will update in a couple days. Thanks again!