Have just got an 80mm silver shutter lens with the same problem, but only below 1/30th.
Ebay seller was very reasonable and i've only paid about £20 for it in total now.
PJ Camera repairs in the UK have dealt with sticky shutters for me before, they're good value and turnaround is 2-3 weeks. They want £40+vat for the job. Fair price, but I can get a blue dot 80mm for 70 quid and the lens coating and flare resistance has been my main problem with the 65mm lens so far.
Now pondering if i should attempt repair myself, and if it goes wrong i have a lens board and viewing lens to use for a pinhole.