My Time Machine keeps asking to complete a new backup instantly after I just created a new back up

I recentlly starting using a Seagate wireless external hard drive to back up with Time Machine. The initial back up took 8-10 hours and that was at the beginning of April. Now at least once a week if not more Time Machine will give me a prompt saying "Time Machine completed a verification of  your backups on "XXX." To improve reliability Time Machine must create a new backup for you. Click start new back up to create a new back up. This will remove your exisiting backup history. This could take several hours."
I understand how the initial back up can take hours. What I don't understand is why Time Machine is no longer taking snapshots of my computer to back up and instead has to delete what back up history I have and start all over. It's time consuming and doesn't make me feel very safe about my back ups. I've tried exploring the Time Machine preferences but there really isn't much I can figure out to change. I contacted Seagate directly and since I'm not using their software only their device they say it's an Apple and Time Machine problem.
Why is this happening and how can I change the settings to avoid having to create an entirely new backup weekly?

Backing up to a third-party NAS with Time Machine is risky, and unacceptably risky if it's your only backup. I know this isn't the answer you want, and I also know that the manufacturer says the device will work with Time Machine, and that it usually seems to work. Except when you try to restore, and find that you can't.
If you want network backup with Time Machine, use as the destination either an Apple Time Capsule or an external hard drive connected to another Mac or to an 802.11ac AirPort base station. Only the 802.11ac base stations support Time Machine, not any older model.
If you're determined to keep using the NAS for backup, your only recourse for any problems that result is to the manufacturer (which will blame Apple.)

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    Ok. I got it to work, sort of....
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    nautical_stars wrote:
    Hi,
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  • MOUNTAIN LION, MBP RETINA : Time machine keeps saying to improve reliability, TM must create a new backup for you

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    Scott F wrote:
    Time Machine completed a verification of your backups. To improve reliability, Time Machine must create a new backup for you.
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    orchestr wrote:
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