No. Each test (well, 99% of them) opens a browser, logs in, performs the test, closes browser.
Only reason I close Kat is when it’s out of memory and crashed - but that’s dev work, not suite executions. Start here if you want the gory details…
Brett, I could easily return this to Bug Reports, but I know what will happen, there’s nothing in this that can point a developer to the cause. 