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CCS/TMS320DM6435: DM6435 - Problem with UART: after a while, data is no longer transmitted

Part Number: TMS320DM6435

Tool/software: Code Composer Studio

Hi, All!
The problem with the UART: speed 115200, after some time, the data ceases to be transmitted, although the sending function returns that in ok
To start the transfer, you need to restart the chip, re-initializing the driver does not help.
UART stops working after about 7-8 hours when sending data 800-1000 kb at summ , while there were 500 transactions TX-RX

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uart0DevParams.inputFreq = PSP_UART_MODULE_CLOCK;
uart0DevParams.fifoEnable = TRUE;
uart0DevParams.opMode = PSP_OPMODE_INTERRUPT; uart0DevParams.loopbackEnabled = FALSE;

uart0DevParams.baudRate = PSP_UART_BAUD_RATE_115_2K;
uart0DevParams.stopBits = PSP_UART_NUM_STOP_BITS_1;
uart0DevParams.charLen = PSP_UART_CHARLEN_8;
uart0DevParams.parity = PSP_UART_PARITY_NONE;
uart0DevParams.rxThreshold = PSP_UART_RX_TRIG14;
uart0DevParams.fc.fcType = PSP_UART_FC_TYPE_NONE;
uart0DevParams.fc.fcParam = PSP_UART_FC_NONE;

Sys/Bios: 6.41.0.26
DSP/BIOS UART Device Driver
Release 1.10.03
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