I have been in my home for about 3 months. Just in the last 3 or 4 days when taking a shower and after about 10 minutes I start to hear a hum from the pipes than very shortly after the pipes start to bang very loudly. If I turn on the sink it goes away for a short period than comes back. The only thing I did recently was shut my main off after my basement flooded and I thought it was leaking. It wasn't so (it was from the weather) I turned it back on but without realizing it I only turned it on half way. Thats when the banging started. I then thought about it and checked the valve. I then turned it on all the way and it still happens. I shut the valve and turned on all water sources then turned the valve back on but it still happens.