If it is new: contact the reseller. If it is not new/under warranty: maybe replace some pressure valves? Maybe the Ulka EX5 vibration pump is not quite ok? (It happens. Descaling sometimes helps as well, but it can also cause some problems if bits of debris get loose.).
The Rocky is doing a great job! I'm liking it a lot so far. I'm sure down the road I'll end up with a stepless grinder to refine my espresso even more but for now I'm having a great time with the Rocky!
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