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First you need the OHM rating of the subs. Most of the time its on the box or the magnet on the back of the subs (normaly 2ohm 4ohm or 8ohm) And that of the amp. Most amps are 4 ohm output if its a 2channel and 2ohm output if its a mono. You NEED to know these cuz wiring it wrong can blow channels in your amp or cause it to cut "in and out"
It sounds like one or more of the output components is failing on the amp. You can contact Kicker support directly for instructions to return the amp for repair: firstname.lastname@example.org . Alternatively, if you have a local car audio shop that does component level repairs, they could perhaps save you some money and time.
rewire the subs-each sub you want in series=8 ohms per sub-then at the amp wire the two 8 ohm subs in parallel which brings the ohms back down to 4 ohms which is optimal for the amp and it shouldnt shut down on you any more-try that-good luck
The Kicker 08ZX400.1 would be a great amp for your subwoofer. It will work into a 4ohm load with no problems.
But you can buy an amp with more power, looks better, has a smaller footprint, and cost less than the 400.1. I'd look at the Alpine MRP-M500. Take a look at it here at Crutchfield. The M500 is also easy to install, runs cool, and is very efficient.
For maximum power, you'll need to wire the subs so that they present a 2 ohm load to the sub outputs on your amp. That will give you the full 420 watts RMS the amp is rated for. Likewise, you,ll want the run the front 4-channels at 2 ohms. Run separately, they produce 85 Watts times 4 channels, or if bridged, 130 watts times 2-channels. But if you run fronts at 4 ohms, they only produce 70 watts times 4 channels and your sub output at 4 ohms drops to 210 watts.
Run the subs in series then bridge the amp. So run the normal + to - to the one sub then hook up a spare wire (not connected to the amp) to the same + and - connections. Then run the spare wire to the + and - of the other sub. This will tie the 2 together so you can bridge the ampfor more power instead of using 2 seperate channels.
recommended maximum for the sub boxes is 1600/800
here is the link to the manual if you need it;
If you really wanted to get the maximum from your subs then a zx750, or possibly a zx1000 would be the ideal choice. Either amp you suggested will work, but you will have more fun with a 750 which should do fine.
Hope this helps :)