Lots of cache miss on Laravel 5

We are using laravel 5.4 on centos 7.3 and php 5.6

A while back we experinced a lot of cache errors and took advice on serialization/deserialization as per unserialize() [function.unserialize]: Error at offset

Over time we experienced slowdown in the system. Today we started tracking why there's such slowdown and discovered a lot of cache misses.

We thought problem was with file cache and decided to switch to redis, as per advice on http://ift.tt/2sYmJ6B. Part of config/cache.php now looks like:

    'default' => env('CACHE_DRIVER', 'redis'),

    'redis' => [
        'driver' => 'redis',
        'connection' => 'default',
    ],

We have a small function to test if cache is being hit:

/**
*
* Test cache
*
**/
public static function cacheTest(){
    $cacheKey = 'CACHE-HIT-MISS';
    $minutes = 60*24*30*12; // cache for 1 year

    $tested = Cache::remember($cacheKey, $minutes, function() {

        error_log("cache missed");


        return "Cached";

    });

    return $tested;

}

Ideally we shouldn't get "cache missed" till after a year but for unknown reasons we are always hitting "cache missed".

Any idea?

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