Ah, another Polaris with a sweet tooth! (keeps nibbling on the wedding cake....) Mine is like that too.
Does it just hang on the floor or is it capable of climbing the walls? If it never climbs the walls then your pressure is a little too low. Check the screen on the quick-release, see if it's plugged. Or if you have one of the pressure-reducing discs in there, take it out.
If it can climb walls, but can't seem to reach the wall by the steps (hose brings it up short), then I'd agree the hose is a foot or two short.
Mine runs into the corner and keeps bumping on the steps, not quite able to climb onto them. Sometimes I find that twisting the backup thingy so it's oriented a different direction will help. Sometimes I just nudge it out of the corner, and typically it goes quite a while before it needs another sugar fix.
--paulr