This could be the boot media having issues, these errors "kernel:Info fld=0x0" also can come from a RAID controller as well. I would check the dmesg2 and critical error logs to see if there is any mention after this error showing the following "sda or sdb or sdc..." to get closer to where it is exactly.
Without knowing what version you are running, you could try to stop and start the Apache from the Console screen byt entering in CTRL + ALT + T then select "Addons" then select "Apache" and stop it then start it again. Also from the Console tools try to do the Time settings and just keep hitting Enter to take the defaults to see if that will kick start it. It could be that the boot media is failing or has issues and cant get the Apache to load.
Lucky for me I had some 1 year old copy of that usb pen... just recreated the image to a new usb pen... all is working now...
This Open-e 6 is a licensed version, can I upgrade free to version 7?
If you purchased the DSS V6 after May 1st of last year then yes you qualify for the free upgrade and you can do this in your User Portal from the Open-E site.