There is a steam leak from the value or from the value fitting extruding from the steam (or water) heat sensor. This is the place where the temperature sensor can be adjusted using a screwdriver. I cannot tell if this is normal steam release that can be remedied by lowering the temperature setting, or if it is an actual leak. Also, there have been instances where the water being fed into the grouper contains a sufficient amount of steam to force the water out of the grouper sideways. I feel like this could be a symptom of too hot a temperature, but it also might be an issue with a shortage of water resulting from the "steam leak. " Also worth note: There have been some issues with the electricity in the building where the machine is operating that also seem to cause some problems with the water pressure. (The power seems to brown out to about 200V)
Your machine is over temperature. check your gauge pressure must be 1.2 bar only and you need to check if pressostat is cutting out and tighten the leaking fittings.
SOURCE: espresso machine loses steam than recovers in minutes
It sounds like a heating element issue. Those elements look like a single unit but are actually made up of 2 or 3 independent heating coils - one may not be working. So, you're only getting 1/2 to 2/3 heating capacity, which isn't noticeable until the machine is under heavy steam load.
SOURCE: after steaming milk has a metallic taste also
run some vinger and water through it a few times then try it out again.
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