Getting 'Too many redirects' error

Hi everyone,
I have a web ( with simply a list block that open a detail block for an item. It’s ben working ok since the beginig of the year, but from 2 or 3 days we started experiencing problems when I open some items, and receiving the error ‘too many redirects’.
Not in all items, only some items… I not modified the item detail page for a long time, so it’s weird…
I raised a ticket to my hosting service, but they checked and says that the dns config it’s ok and the problem it’s on soft… I reconfigured the dns, but I’ve still the error.
I tried from a diferent browsers, computers, connections,…

Any suggestions?

Thanks in advance.