First, version numbers, exactly what you see as a problem (is this with verified trials, unverified trials, activations, etc.?)
See: https://wyday.com/limelm/help/faq/#useful-reports
If you're not using the latest version of TurboActivate (4.1.7.0), then do that first, try again.
If you *are* using the latest version of TA, and you're using verified trial, and the trials are expiring sooner than you expected, then it's always because of customer shenanigans. Namely, them trying to get extra free days. When TurboActivate detects client-side fraud, it doesn't try to determine the "real" amount of days remaining, instead it just immediately expires the trial.
For these customers you can send trial extensions: https://wyday.com/limelm/help/trials/#extensions
Also, tell them not to do that.