Lumia 535 bluetooth windows 10

Dear Microsoft Community,

I have recently bought a bluetooth keyboard, wich i would like to used with my Lumia 535 dual sim with windows 10. But after I pair the phone with the keyboard they disconnect from each other in a few seconds (i entered the password on the keyboard and they paired before this happens) and my phone says there are no bluetooth devices connected. I tried the keyboard with a lumia 550 (windows 10) and it worked perfectly so I think the problem is with my phone. Please help.

Thanks in advance.