Kenster
Hello & Welcome to the Forum!
Sorry to hear about your power problem. 
You've already done step one one dealing with it, next, get out your multi-meter, power up the track and check section by section to see where you are losing connectivity.  It is quite possible that you have corroded/dirty pin and ends on your track & not getting good connectivity a possible problem with permanently attached track to layout. If your continuity is bad, you might want to consider attaching another feeder at the center point where your power drops or take up the track pieces clean and the ends or just replace them with new good track.
You didn't mention how much track you have laid and how much power you are trying to use...

Happy Rails!
dave