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If you're having a problem with cache expiration use a remote monitoring app like CopperEgg[1] (free) or Pingdom[2] (paid). Not only will it monitor your site and send alerts if it goes down or is slow, it will keep your cache fresh and full.

1: http://copperegg.com/

2: https://www.pingdom.com/

Pingdom also has free option.

for only one site.

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