I have been experincing some paronormal stuff?

Ok well recently (about 2 months ago) my friend ped away and i have been experiencing weird things, the first thing that happened was when i was at her funeral i felt this weird rumble under the ground (like a vibration) but no one else felt it, then about 3 weeks ago the radio turned on by itself and Im Yours by Jason Mraz came on (it was her favorite song ever) then about 3 hours after that the radio turned on again and the same song came on (im yours), then just a few days after that i felt a hand on my shoulder, i thought it was just my mum so i said "hi mum" but then i remembered no one was home then i turned around and nothing was there, im 100% sure i felt something and then just a few minutes after that my mobile was calling and it was calling from my friends cel phone but i thought it was strange because they buried a few thing with her and one of them things was her cel, i answered it but when i did my phone just shut itself down, then it all went quiet for a few weeks then just a few hours ago the radio thing happened again, is this real or is it just a coincidence? should i call some paranormal investigators or something? im really freaked out