502 error and slow websites when using WPMU Dev Dashboard

We had to deactivate the WPMU DEV Dashboard plugins in all our websites. The plugin was slowing them down, timing out and throwing error 502 since 2 days ago. More info:

- All 10 websites with this problem are hosted on WP Engine
- It happened to both multisite (subdomains) and single site installs
- The error occurs only when WPMU Dev Dashboard is installed and active. When we deactivated other plugins (including WPMU Dev ones) and used WP default theme, keeping WPMU Dashboard only, we had the 502 error. If we keep all other plugins and theme active, but deactivate WPMU Dashboard, it works properly.

Can you guys help us?