Computer keeps restarting

I have a iMac and recently it has been restarting randomly. I am not a tech person, but I know that is not supposed to happen.

I looked at the report that is generated and it is saying something about it restarted because of a panic function?

*** Panic Report ***

panic(cpu 3 caller 0xffffff8013805446): "a freed zone element has been modified in zone kalloc.128: expected 0xdeadbeefdeadbeef but found 0xffffff805e2db3d0, bits changed 0x2152416f80800d3f, at offset 88 of 128 in element 0xffffff803559a100, cookies 0x3f0011a8a5d413f8 0x5352165c6b6ec29"@/BuildRoot/Library/Caches/com.apple.xbs/Sources/xnu/xnu-4903.278.28/osfmk/kern/zalloc.c:1206

Backtrace (CPU 3), Frame : Return Address

0xffffff81f3d63260 : 0xffffff80137af58d

0xffffff81f3d632b0 : 0xffffff80138eb145

0xffffff81f3d632f0 : 0xffffff80138dc87a

0xffffff81f3d63360 : 0xffffff801375c9d0

0xffffff81f3d63380 : 0xffffff80137aefa7

0xffffff81f3d634a0 : 0xffffff80137aedf3

0xffffff81f3d63510 : 0xffffff8013805446

0xffffff81f3d63660 : 0xffffff80137bba54

0xffffff81f3d636d0 : 0xffffff8013e6bbe5

0xffffff81f3d637c0 : 0xffffff8013e6a208

0xffffff81f3d63860 : 0xffffff8013e70393

0xffffff81f3d638a0 : 0xffffff7f9700b479

0xffffff81f3d63940 : 0xffffff7f96fe1258

0xffffff81f3d63990 : 0xffffff7f96fdacfd

0xffffff81f3d639e0 : 0xffffff7f96fe2a5b

0xffffff81f3d63a50 : 0xffffff7f96fe42db

0xffffff81f3d63a90 : 0xffffff8013e84e88

0xffffff81f3d63ae0 : 0xffffff7f96fe4631

0xffffff81f3d63b30 : 0xffffff8013e8e322

0xffffff81f3d63c70 : 0xffffff8013897596

0xffffff81f3d63d80 : 0xffffff80137b4dcc

0xffffff81f3d63dd0 : 0xffffff801378fb41

0xffffff81f3d63e50 : 0xffffff80137a425e

0xffffff81f3d63ef0 : 0xffffff80138c27b7

0xffffff81f3d63fa0 : 0xffffff801375d1b6

Kernel Extensions in backtrace:

com.apple.iokit.IOAcceleratorFamily2(404.14)[A89211C3-203C-3F08-AF43-47E5179B166A]@0xffffff7f96fc4000->0xffffff7f97069fff

dependency: com.apple.driver.AppleMobileFileIntegrity(1.0.5)[2C186818-6D29-3A4B-BC2D-A810FC514FEA]@0xffffff7f946af000

dependency: com.apple.iokit.IOSurface(255.6.1)[51C0A6EC-149C-3ECE-92E5-ACF817AE1699]@0xffffff7f96f58000

dependency: com.apple.iokit.IOPCIFamily(2.9)[F9449D20-0DF4-3A92-9532-7E6917DFF1A6]@0xffffff7f94095000

dependency: com.apple.iokit.IOGraphicsFamily(530.68)[3108B928-3E0F-34FF-B9C8-F345592F4B27]@0xffffff7f96f79000

dependency: com.apple.iokit.IOReportFamily(47)[F9CF3B44-D9FA-3470-ABA5-79877BD0B46C]@0xffffff7f94d1f000

Does anyone know what that mean?