why when i use gnuradio for USRP with UHD for high sample rate record file is not work

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I use a USRP x300, when i want to use uhd and file sink in gnuradio , for high sample rate like 60M or 80M gnuradio can not record file.Gnuradio print some character on log: i want to record a sample not any other thing.
Is there any way that i can record with high sample rate in gnuradio?

my system is powerful:
Core i7
RAM 16
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