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AM3354: RTC accuracy

Part Number: AM3354

Hi,

My customer is evaluating AM3354 RTC and checked the accuracy of the calendar.
He found +15min differences in 6 hours. (6 hours in real time vs 6 hours 15min in RTC)
This is more than 4% error and I think it is too much.

The RTC clock is RTC32KCLK(32k_aux_clk) from Peripheral PLL.
The RTC is running in Functional mode.

What are potential causes of such big errors?

Thanks and regards,
Koichiro Tashiro