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After installing Kubuntu 18.10 sometimes my laptop freezes for 1-2 minutes and then resumes working without any error. this is the exception in my syslog file:

Jan 10 16:32:53 X450LD kernel: [35259.308938] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x40000 action 0x6 frozen
Jan 10 16:32:53 X450LD kernel: [35259.308950] ata1: SError: { CommWake }
Jan 10 16:32:53 X450LD kernel: [35259.308957] ata1.00: failed command: FLUSH CACHE EXT
Jan 10 16:32:53 X450LD kernel: [35259.308973] ata1.00: cmd ea/00:00:00:00:00/00:00:00:00:00/a0 tag 17
Jan 10 16:32:53 X450LD kernel: [35259.308973]          res 40/00:01:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
Jan 10 16:32:53 X450LD kernel: [35259.308980] ata1.00: status: { DRDY }
Jan 10 16:32:53 X450LD kernel: [35259.308989] ata1: hard resetting link
Jan 10 16:32:59 X450LD kernel: [35264.676880] ata1: link is slow to respond, please be patient (ready=0)
Jan 10 16:33:02 X450LD kernel: [35267.648849] ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
Jan 10 16:33:03 X450LD kernel: [35268.624839] ata1.00: configured for UDMA/133
Jan 10 16:33:03 X450LD kernel: [35268.624846] ata1.00: retrying FLUSH 0xea Emask 0x4
Jan 10 16:33:03 X450LD kernel: [35268.909553] ata1: EH complete

Also few days ago after freezing, it didn't resume and i powered of my laptop using power key. Then restarted it and system went into BIOS and sayed there isn't any bootable device! after some time i turn on it again and everything works fine!

Can anyone help me? What does that exception says? I bought laptop drive a few months ago and didn't test hard drive in ubuntu 18.04 or lower.

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