I have the same problem as here: Cart dropping all items / cart session clears
Although the answer seems to work for the questioner, for me it doesn't. I have really tried "everything" now:
- Set session.gc_maxlifetime to 12 hours
- Changed Magento session storage from db to files
- Set all Magento cookie validation settings to "No"
- Cleaned all caches, and cache storage (memcached)
- Validated that the session lifetime in cookie is using the
In detail, the session gets cleared after some seconds of inactivity. If I do a fast "developer checkout" within a few seconds, I have no problems to checkout. But as you surely know not all customers are fast in typing and so on. The furthermore strange thing is, that after this happened once, it is working again for the next one or two times.
I would really appreciate any kind of idea to this.