I feel very strongly led to share this link below. We have many professing Christians here on FR that engage in this sin. This is an admonition from the Lord that must be heeded at this time.
https://www.bibletools.org/index.cfm/fuseaction/topical.show/RTD/cgg/ID/749/Murmuring.htm
Do not be quick with your mouth, do not be hasty in your heart to utter anything before God. God is in heaven and you are on earth, so let your words be few. ~ Ecclesiastes 5:2