Problem wit Keyboard - SIM Processor warning

Hello, I purchased from you (Ordered on 26 September 2019 with Order number: 402-7143938-0921921) a CHUWI Hi9 Plus 4G LTE Dual SIM Tablet PC 10.8 Inches Android 8.0 OS (MTK Helio X27) Ten-Core Up to 2.7GHz 1600 * 2560 IPS 4GB RAM 128GB ROM WIFI Type-c (with keyboard and pen). The tablet freezes and continuously resets the device. I noticed that connected to the keyboard it presents the problem, it turns on and off continuously until it is disconnected from the keyboard.
Can you please help me to resolve the matter. the tablet has a legal guarantee as communicated by Amazon. looking forward to yours, I cordially greet you.