Ambika: Pitch "jumps" when modulating certain notes

Hello! I recently bought an Ambika (smr4x6) and I have the following problem:
In several octaves, in A# and B, when applying modulation to the pitch (an LFO or pitch bend), there are some “jumps”, like abrupts silences/clicks. It happens in every voice but only in those notes. Is this a common problem? Is there something to fix in hardware or software? Thank you for your time!

Ambika (1.7 MB)

Anyone has any idea? Sorry to bump this!