Issue with Caching Optimiser On Siteground Server causing booking engine to slow

We have a booking engine for parking spaces – WordPress – Plugin

All running fine for weeks.

Now we have an issue with it slowing and failing to move to the the next stage in the booking – ajax 5 stage booking process – one screen.

We have identified that the speed optimiser plugin on Siteground server is causing an issue. If we flush the cache the booking engine will run fine for about 30 mins and then it slows. Some customers get a total pause in the process (won’t move to net stage of booking). customers report errors … but as soon as we flush cache it is resolved.

Need an experienced developer that is familiar with site ground caching tool, that can maybe write a script to run cache purge every 10 minutes. or look at way to resolve the issue.

Thanks