Phone strange shut down after overheating

I have rooted Gigabyte gsmart Arty A3 i rooted it about 3 week erlier and i am fighting with problem
The problem is my phone is overheating and shuting down with strange laud noises and strange pictures. It happens when phone is overheating, but not mutch. I mainly surf internet and play games, but not long abot 5-30 minutes. That problem started about 4-6 months erlier. Please help me to solve this problem l have made factory reset about 2 times and still it hapends.
Sorry from bad English i am from Latvia

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