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[Traam]

A few brain storming questions.
Can you use OSD settings and watch voltage and current to see if it drops suddenly?
  If its power related the OSD may show it in goggles.
 Are you trying more than one lipo?A bad cell could cause sudden power loss.
  How does your battery to ESC + and - solder joints look?Especially the ground.A reflow using flux may be worth a try.
  Watching the OSD voltage and current may show if its a power issue???

I will check the OSD for the power loss. I have used all Lipos that I have and same issue with each. I also plan to resolder everything again to see if it is a cold joint issue. At the moment I have taken my receiver off the quad to put it on another one. If I end up figuring the issue out I will update this thread. Thank you all for the help! 

[Dagger-one]

Hi I am going to build an fpv drone I am following the step-by-step guide this is the guide I'm following https://oscarliang.com/how-to-build-fpv-drone/                   I am wondering what controller I will need and what fpv goggles I will need as well.  Thanks for any help.

[matt0725]

Dagger, welcome to the forum! you could make your own thread on this if you like, so for a short answer to not take over an old thread, for FPV goggles, it depends if you are using analog, or digital. If you use digital, there are 3 brands right now, and each sells their own goggles. You can look around on oscar's website for the pros and cons of each, or again, in a dedicated thread we can get into specifics.

as for a controller, most people will recommend a radiomaster controller and an ELRS receiver for maximum range and performance. Oscar's websites shows a bunch of different models of everything so you can also decide which you like.