I have a phpList installation that has been running well for 10 years. Suddenly we are getting a generic error “429 too many requests” when working on a new campaign. It can appear when clicking Save and continue editing or when moving to the next tab. It happened last week and self-resolved after a day - but has returned and continues.
I have removed a MessageStatisticsPlugin plugin and tested with the same result. The only other plugin enabled is CommonPlugin and I have disabled that and tested with the same result.
I have upgraded the installation and database to the latest version 3.6.7 and the error still occurs.
Any suggestions on where to check next would be greatly appreciated! Thank you!