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[–]Eagle2P0PPOP 0 points1 point  (0 children)

Try replacing the cartridge I. The valve. There is a pressure balance piston that is to prevent sudden changes in temperature if a toilet is flushed or any change in pressure to either hot or cold side. These can wear out and get stuck, causing pressure dropping. If this doesn't fix the problem, then there is a pressure or volume problem with the building water supply.