Do I need to upgrade our subscription?

people are getting a "form over Quota" message

You receive this error when your submissions exceed the limit for your account type. The free account is limited to 100 submissions per month.

The error is documented here:

Understanding Different Form Errors

So you have two options here:

1. Upgrade your account. If you log in you can compare plans here:

https://www.jotform.com/myaccount/billing

2. Or, wait until the 1st of next month. Your quota's will reset on the first day of every month.