Sometimes the website product / search pages throws the following error
The provided content link does not have a value. Parameter name: contentLink
After the website restart it begins to work properly.
This was caused by a bug http://world.episerver.com/support/Bug-list/bug/CMS-7806. When the simple address is being processed, the CMS simpleaddress handler is called before the Commerce simple address handler.
Please upgrade the solution to latest of CMS and Commerce to resolve this issue.