Acer Aspire V3 575G Wifi Signals Problem

Hello Everyone. I recently bought an Acer's Aspire V3-575G. I used it a few days but now I realised that it has a problem with its WIFI ADAPTER. The problem is that whenever i close the lid of my laptop, the wifi signals drop considerably. Sometimes it just disconnects from the internet completely. I have checked all the power options that may turn off wifi to save battery and turned them off but the problem is still there. Please Help me. Thanks