Recently I have experienced a phenolic taste in my beer two to three weeks after carbonation occurs. The flavor is not there in secondary or at time of bottling. I scrub all bottles soaked in one step then bleach then blasted out under high pressure then starsan before a antibacterial wash cycle. My hoses and siphon and bottles are all used by a friend at the same time that does extract brewing. I do all grain but I have the problem. It is odd that usually the beer starts out fine and increases in bad flavors. Always phenolic. Any ideas