If you have problems with the One Plus One, such as touch screen sensitivity, Bluetooth connection or issues with MMS texts; then try the latest update of Cyanogen OS, build number YNG1TAS2I3, to fix all of those bugs.
The update is now available through Cyanogen website, visit here to download full ROM and flash your OnePlus One smartphone in recovery mode. The ROM weighs 566MB and actually small for a Lollipop firmware.
Your device is on the build number YNG1TAS17L ? Then try the incremental OTA file instead of full ROM, weighs about 20MB.
If you have already updated the phone, let us know if errors are fixed.