Thank you for your post and welcome to the Bose Community.
I'm sorry to hear that you are having difficulty keeping a Bluetooth connection between your Frames and your iPhone 6.
Do you have another device that you could connect to the Frames and test if this problem is consistent?
I would recommend that you remove the Frames from the device list on your iPhone and re-connect them.
If the problem is consistent with another device, I would recommend calling our Customer Service team to discuss this matter further.
Global Contact Us > Select your country > Scroll to the bottom > Click 'Contact Us'
Let me know if you need any further help.
Charlotte G - Community Support