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Digital shared variables stop working

I have many shared variables bound to Fieldpoint channels with OPC (DSC 8.2). Sometimes, all the digital input and output variables stop working at the same time, with no apparent reason. In Variable Manager their quality shows as "subnormal". If i try to read/write any variable, i get error -1950679030 (Unspecified error) at ni_tagger_lv_read or ni_tagger_lv_write (writing works, though).
The Fieldpoints keep working perfectly and i can normally access all the channels in MAX, only shared variables don't work.
The variables never get to work again (it happened friday night last time, and i discovered it monday morning!), until their vaule changes. When the value of a digital channel changes, the bound shared variable starts working again, and its quality gets back to "good".
The only way to make all the variables work again is manually undeploy and redeploy the library. Any hint?

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