500 Error during registration caused by CAPTHCA store size limitation

Users receive 500 HTTP Server error when trying to register if the CAPTHCA is configured on their server. The issue occurs across multiple CAPTHCA types (sound, image, etc).

Error identified in the stack trace:

com.octo.captcha.service.CaptchaServiceException: Store is full, try to increase CaptchaStore Size orto decrease time out, or to decrease CaptchaStoreSizeBeforeGrbageCollection

The issue seems to happen because the CAPTCHA service can't handle many requests well.