I had this issue on my 05 LR3: dealer replaced the EAS pump and one bag. Had this problem, but less so, on my 08 RRS/SC, dealer determined it was normal. Never had it on the 13 HSE. Some of the earliest EAS systems had some issues: but these were pretty well taken care of by 08. But with an 08 and high mileage, I would suspect a leak.