Coca-Cola South Africa
Tab taste not consistent

I have been drinking tab for about 6 years now and enjoy it. Unfortunately, the last two months the tab has had a completely different taste. It's not consistent though. Sometimes it tastes normal but other times it tastes almost as if it is mixed with the old vanilla coke. Are you guys experimenting with new flavours? Is it just a bad batch? Please she'd some light here. I have actually stopped buying tab now. I have kept a two liter if you want to test it.