Can a person be born again more than one time? Please back up with scriptures (and, or with Church fathers).
Jesus called the Word of God a seed in the parable of the sower and the seed. A seed can be planted without germinating and remain in the soil for many years before germination occurs. Likewise, people can receive the Word as a seed in their heart without having the new birth, but think they are Christians because they temporarily embraced the faith.
When the seed of the Word germinates in truth, the new birth will be experienced. For some it might be a mild experience but later on becomes greater with maturity and deeper faith. That person may think he had a second rebirth, but it is still the same new birth the first time that has finally blossomed.
This brings up the question, can a person lose their faith? The answer is, yes, but it is very difficult. Hebrews 6 alludes to this. How can one be unborn? By dying. The process of death of one's faith is the hardening of the heart. The new birth circumcises the heart, but, like our skin, it can become calloused when enough friction, such as caused by holding the handle of a shovel with many diggings, rubs the skin over time that hardness of the skin grows to protect the tissue.
Likewise with our spiritual hearts. Enough discouragement, fear, abuse, rejection, belittling, or willful engagement in sinful activities, will harden a heart to protect it from the voice of the conscience, or the rebukes of the Lord. When someone reaches a point when they absolutely do not want to walk with God anymore, their new birth dies. Not that the Holy Spirit leaves them. Instead they leave the Holy Spirit. But even in this scenario I believe the Lord will still do all that he can, without violating a person's free will, to draw them back. Nonetheless the writer of Hebrews says:
Heb 6:4 For it is impossible for those who were once enlightened, and have tasted of the heavenly gift, and were made partakers of the Holy Ghost, ...
Heb 6:6 If they shall fall away, to renew them again unto repentance; seeing they crucify to themselves the Son of God afresh, and put him to an open shame.
We guard our hearts from hardness of heart by keeping our minds on the Lord and responding in obedience to his promptings.