Bluetooth Interference on MacBook Pro

Hello World! It's my first time asking a question here. I have a MacBook Pro 13" Mid 2012, and I am having trouble with the Bluetooth connection between my devices. Last year, I bought an Apple Wireless Keyboard, and once in a while (about 3 times in a day), the message "Keyboard Disconnected" followed by "Keyboard Connected" appeared. It bothered me but it resolves itself very quickly, so I don't care much. Last month, I moved to a new house, and now I can't use Airdrop at all with my iPhone 5s. I can't use Airdrop while I am in my house; I tried in other places and it worked (maybe I was lucky). I have already done everything I could find on the internet (reset bluetooth.plist files, changed my router to another -I do have 2.4ghz Wi-Fi, but in my previous home Airdrop did work fine-, reset NVRAM and SMC, turned off both devices and reset the Bluetooth module). So Airdrop doesn't work since a month ago. Also, I have a Bluetooth speaker, and whenever I pair it with my Mac and the distance between them changes, the music lags, like it is some kind of interference. This doesn't occur when I pair the speaker with other devices (iPhone, iPods), only with my Mac. I'm starting to think it has a problem with the Bluetooth chip, since the keyboard intermittently disconnects, the music in my speaker lags and I can't use Airdrop. Is there any way to change the Bluetooth channel, like you can with your Wi-Fi? Is there any way to solve this problem? Thank you very much.