You should replace your dual-freq beacon. The requirements to make that beacon operate on both 2.2 and 457 make it a poor performer on both. The 457kHz standard was imposed in the US in 1996, making your beacon almost 10 years old at best. It should be replaced or serviced for that reason alone.
Ortovox is notorious for troubles with customer service, though I'm sure some have had good luck with a beacon refurbish. They do provide the above service, however. It will cost you a good portion of a new beacon to pay for it.
I recommend the BCA Tracker beacon, for what that's worth. I'm sure the other digital beacons are as good if used enough. I prefer to wait on "new" beacon designs such as the Pieps model to see what issues arise during the first season or two. They're also fricken expensive, even on "deal".