Qur'an

Giving one's own interpretation of the Quraan Majeed

Q: I went to visit a family member. They had some notes lying around. They told me they were going to do a tafseer class. I read over the notes and found some very strange explanation of the Quraan. 

When I looked in the tafeer, I noticed the notes were from Ma'ariful Quraan but they had added their own interpretation trying to say a Surah is promoting Dunya. 

Will a person who twists the tafseer to suit him be a kafir or what will his status be?

Playing the Quraan in the home with the intention of protection and bringing barakah in the home

Q: My question is with regards to the Qur'aan cube/speaker. Is it permissible to keep the Quraan playing in the home while cooking, doing mundane daily tasks and leaving the Quraan playing while being in another room? Is this disrespectful to the Quraan Shareef or can it be done with the intention of protection and bringing barakah in the home?