digi+: no sound anymore with osmc on RPI3

Hi all,
my hifiberry digi+ used to work perfectly with OSMC on my RPI3.
Then I tried to install some other audio related software (snips, already disabled all services) and had to go back to an older kernel after an update (my wifi dongle was no longer supported).
Now I have no sound anymore...not sure what action has messed up my installation. I have managed to get the sound back my starting alsamixer using ssh, and selecting the already preselected AIF source again (very strange), but this is not working all the time...
Any idea is welcome....I probably need a fresh installation....