I also have the Pioneer 107D but I updated to the 116 Fimware hack! I read to many conflicting reports about the 118 firmware hack so I am not prepared to go there! 116 hasnt missed a beat for me and does everything I want it to do! The good news for you is the Firmware Upgrades are reversable!
Why dont you install another version, say the 116.
And I do relize (just before to many people start commenting) there are many people out there that say they dont have a problem with the 118 Upgrade!
I forgot to ask, did you use the Pioneer Official 118 or one of the Hacked ones?
And I hope I can say this on this forum? I used 'Nils' 116 firmware Hack! It allows you to use 4x disks at 8x!
And for anyone in South Australia, The Strathfield own brand 4x work at 8x!!
Hope this helps.
