Hmm, yes, ix2 is almost always one of the two internal links to the switch. It should not ever lose link.
The only time that wouldn't be an internal link is if you have an expansion card fitted that also uses the ix driver.
One thing you could do is reconfigure it to use only ix3 instead of a lagg of ix2 and ix3. Assuming you are not also seeing ix3 lose link.
Steve