php - Intermittent error Laravel5 Cannot declare ... because the name is already in use -


we have been getting -intermittent- errors in our log (which correspond http 50x error 'spikes') problem seems go away on own while , come back.

error: symfony\component\debug\exception\fatalerrorexception: cannot declare class illuminate\session\store, because name in use

and

error: symfony\component\debug\exception\fatalerrorexception: cannot declare class illuminate\session\store, because name in use in

and

error: symfony\component\debug\exception\fatalerrorexception: cannot declare trait illuminate\validation\validateswhenresolvedtrait

neither of these directly related app code, purely in vendor stuff cannot figure out why works of time seems wobble @ random times throughout day. doubt different portions of app simple pretty linear activity flow.

this not seem related deployments , traffic, ram , cpu relatively low @ these times.

i have tried googling , there plenty, not seems intermittent version, or these specific class & trait.

any enlightenment on appreciated

here composer json if helps:

    "name": "laravel/laravel", "description": "the laravel framework.", "keywords": ["framework", "laravel"], "license": "mit", "type": "project", "require": {     "php": ">=5.6.4",     "laravel/framework": "5.3.*",     "maatwebsite/excel": "~2.1.0",     "laravelcollective/html": "^5.3",     "intervention/image": "^2.3" }, "require-dev": {     "fzaninotto/faker": "~1.4",     "mockery/mockery": "0.9.*",     "phpunit/phpunit": "~5.0",     "symfony/css-selector": "3.1.*",     "symfony/dom-crawler": "3.1.*",     "doctrine/dbal": "~2.3"  }, "autoload": {     "classmap": [         "database"     ],      "psr-4": {         "app\\": "app/"     } }, "autoload-dev": {     "classmap": [         "tests/testcase.php"     ] }, "scripts": {     "post-root-package-install": [         "php -r \"file_exists('.env') || copy('.env.example', '.env');\""     ],     "post-create-project-cmd": [         "php artisan key:generate"     ],     "post-install-cmd": [         "illuminate\\foundation\\composerscripts::postinstall",         "php artisan optimize"     ],     "post-update-cmd": [         "illuminate\\foundation\\composerscripts::postupdate",         "php artisan optimize"     ] }, "config": {     "preferred-install": "dist" }

thanks


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