1260 Infinity HPLC Pressure Fluctuations

Hi all, 

we are having issues with the HPLC data, since the spectrum look like this (pure water):

We have noticed a recent sound from the carrier liquid pump, and notice the pressure is lower than usual with fluctuations:

Is anyone familiar with this issue or have an idea of what could be wrong?
I have no experience with HPLC or troubleshooting of it, so the problem could be rather simple.

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