inconsistent error cannot find module - node.js

Question

I've created a module of my own, let's call him X.
I'm using crontab to run proccesses repeatedly.
Sometimes a proccess might throw an error that he cannot find my module X.
20 10 2016 09:01:06.815 (production) (i-8e4) ERROR console - update.js ERROR: Error: Cannot find module 'X' stack: Error: Cannot find module 'X'
at Function.Module._resolveFilename (module.js:337:15)
at Function.Module._load (module.js:287:25)
at Module.require (module.js:366:17)
at require (module.js:385:17)
at Object.<anonymous> (/home/git/repo/update.js:3:14)
at Module._compile (module.js:435:26)
at Object.Module._extensions..js (module.js:442:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:311:12)
at Module.require (module.js:366:17)
I find that odd since the proccessess are running most of times, probably more then 90% of the times.
I think this is aproblem with packages..
So heres the package.json of module X:
{
"name": "X",
"version": "0.8.2",
"description": "a Library",
"dependencies": {
"async": "^1.4.2",
"aws-sdk": "^2.2.12",
"colors": "^1.1.2",
"cron": "^1.0.9",
"csv": "^0.4.6",
"geoip-lite": "^1.1.6",
"hiredis": "^0.4.1",
"ipaddr.js": "^1.0.3",
"lodash": "^3.10.1",
"log4js": "^0.6.27",
"mobile-detect": "^1.3.0",
"mysql": "^2.9.0",
"node-schedule": "^1.0.0",
"node-timeout": "0.0.4",
"nodemailer": "^1.8.0",
"nodemailer-ses-transport": "^1.3.0",
"password-hash": "^1.2.2",
"path-extra": "^2.0.0",
"pg": "^4.4.2",
"qs": "^5.2.0",
"redis": "^2.2.5",
"request": "^2.65.0",
"request-ip": "^1.1.4",
"s3": "^4.4.0",
"ua-parser-js": "^0.7.9"
},
"devDependencies": {
"eslint": "^1.6.0",
"it-each": "^0.3.1",
"jscs": "^2.3.0"
}
}
main module package.json(it has several proccess that require X)
{
"name": "Main module",
"version": "1.1.6",
"description": "Main module crontab runs his processess that require module X",
"main": "index.js",
"dependencies": {
"async": "^1.5.0",
"chai": "^3.5.0",
"cron": "^1.1.0",
"lodash": "^3.10.1",
"mock-globals": "^0.1.3",
"moment": "^2.13.0",
"node-timeout": "0.0.4",
"nodemailer": "^1.8.0",
"nodemailer-ses-transport": "^1.3.0",
"proxyquire": "^1.7.10",
"redis-mock": "^0.10.0",
"X": "git+ssh://git#github.com:X.git#v0.8.2"
}
}
Having some trouble with this error since it is only happening on production instance..
Any ideas on how to debug/solve this?
Thanks!