I have seen this disortion also sometimes on my Pi. Yes true - after an Restart it normalizes sometimes.
But if not, it is an Quirk with all the Restarts to delete the connection and set it again. But this is OP Problem.
Your Probs seem to lie inside Signal K, maybe it is better to ask in the Signal K at https://signalk-dev.slack.com/
How
But if not, it is an Quirk with all the Restarts to delete the connection and set it again. But this is OP Problem.
Your Probs seem to lie inside Signal K, maybe it is better to ask in the Signal K at https://signalk-dev.slack.com/
How