Random Oil pressure warning light

Hi all need a bit of help with my octavia vrs oil pressure warning light came on whilst at high speed stopped the car checked the oil was full started the car was fine 50 miles later it did it again so I changed the oil and filter used flush it has been fine for way over 1000 miles but tonight it did it again whilst in traffic had a good look this time found badly split breather pipe (lower end) and theres quit a bit of sludge in it but don't think this would course low oil pressure warning I thought maybe oil pressure senser or blocked pick up pipe but unsure as it does it totally random no loss of power or boost and uses no oil has anybody had this problem before I no it's a big ask please help