I get a number of 'An item was expired by the cache while it was locked' warning messages while performing long running processes.

Can someone please tell me what the implication of these messages are?

Do they mean that the integrity of my databse is at risk, or do they only have performance implications?

Will I also see these warnings if an object is removed from the cache due to its small size, as well as exceeding timeToLiveSeconds or timeToIdleSeconds?

Thanks,
Tom