Nothing new here
New ships need testing to find this sort of thing. It's a normal part of the process.
As a comparison, HMS Ark Royal (the WW2 one) was regarded as a pig of a ship to serve on due to excessive vibration caused by having to move the shafts for her props. This was done as there was leakage in the shafts, just like here.
Hence there being no sister ships for any of the subsequent aircraft carriers in the RN.