Mac OS X goes to sleep mode when watching video or suddenly restarts

Mac OS X Catalina goes to sleep right after I start watching video/youtube.
I also can hear how its fan's extensively working.
It started after I installed MineCraft, but this maybe just a coincidence as it's going to sleep mode only when watching a vide.
But right after it's in sleep mode when I push a power button it wakes up with no fan's noise.

I even did a recovery on the OS, the issue remains.

I looked at other SO threads but they were not helpful.

Not sure if this is Catalina's issue or not…

Just wanted to know is there's anything I should try before I decide to downgrade the OS.

UPDATE

I had to delete my answer as I discovered the issue remains.
Also I noticed random restarts. After I restart I see these message in the report:

Mac OS version: 19E287

Kernel version: Darwin Kernel Version 19.4.0: Wed Mar 4 22:28:40 PST
2020; root:xnu-6153.101.6~15/RELEASE_X86_64 Kernel UUID:
AB0AA7EE-3D03-3C21-91AD-5719D79D7AF6 Kernel slide:
0x0000000004400000 Kernel text base: 0xffffff8004600000
__HIB text base: 0xffffff8004500000 System model name: iMac15,1 (Mac-FA842E06C61E91C5) System shutdown begun: NO Panic diags file
available: YES (0x0)

System uptime in nanoseconds: 330571042058 last loaded kext at
122597264899: com.google.drivefs.filesystems.dfsfuse 37.0.8 (addr
0xffffff7f88d27000, size 102400) last unloaded kext at 208687925513:

usb.!UHostPacketFilter 1.0 (addr 0xffffff7f857fa000, size 24576) loaded kexts: com.google.drivefs.filesystems.dfsfuse 37.0.8
com.symantec.ips.kext 9.0.2 com.symantec.nfm.kext 9.0.1
com.symantec.internetSecurity.kext 9.0.3 com.symantec.SymXIPS 9.0.1
!AUpstreamUserClient 3.6.8 @kext.AMDFramebuffer 3.0.8
AudioAUUC 1.70 @kext.AMDRadeonX4000 3.0.8 @kext.AMDRadeonServiceManager 3.0.8
!AGraphicsDevicePolicy 5.1.16 @AGDCPluginDisplayMetrics 5.1.16 @fileutil 20.036.15
!AHV 1 |IOUserEthernet 1.0.1 |IO!BSerialManager 7.0.4f6
pmtelemetry 1
!APlatformEnabler 2.7.0d0
AGPM 111.4.4
X86PlatformShim 1.0.0
!AMikeyHIDDriver 131
!A!IHD5000Graphics 14.0.5 @Dont_Steal_Mac_OS_X 7.0.0
eficheck 1
!AHDA 283.15
!AMikeyDriver 283.15 @kext.AMD9000!C 3.0.8
!AThunderboltIP 3.1.4
!ALPC 3.1 |!ABCM5701Ethernet 10.3.5
!ASMCLMU 212
AirPort.BrcmNIC 1400.1.1
!A!IFramebufferAzul 14.0.5
!A!ISlowAdaptiveClocking 4.0.0
!AMCCSControl 1.11 @filesystems.autofs 3.0
!AVirtIO 1.0 @filesystems.hfs.kext 522.100.5 @!AFSCompression.!AFSCompressionTypeDataless 1.0.0d1 @BootCache 40
@!AFSCompression.!AFSCompressionTypeZlib 1.0.0
@filesystems.apfs 1412.101.1 @private.KextAudit 1.0
!ASDXC 1.7.7
!AAHCIPort 341.0.2
!AACPIButtons 6.1
!ARTC 2.0
!AHPET 1.8
!ASMBIOS 2.1
!AACPIEC 6.1
!AAPIC 1.7 $!AImage4 1 @nke.applicationfirewall 303 $TMSafetyNet 8 @!ASystemPolicy 2.0.0 |EndpointSecurity 1
@kext.AMDRadeonX4070HWLibs 1.0 @kext.AMDRadeonX4000HWServices 3.0.8
!AGraphicsControl 5.1.16 |IOAVB!F 840.3
!ASSE 1.0 @plugin.IOgPTPPlugin 840.3
DspFuncLib 283.15 @kext.OSvKernDSPLib 529 @!AGPUWrangler 5.1.16 |IONDRVSupport 575.1
!AHIDKeyboard 209
!AHDA!C 283.15 |IOHDA!F 283.15 |IOEthernetAVB!C 1.1.0
!ASMBusPCI 1.0.14d1 |IO80211!F 1200.12.2b1
mDNSOffloadUserClient 1.0.1b8
corecapture 1.0.4 |IOSkywalk!F 1 @kext.AMDSupport 3.0.8 @!AGraphicsDeviceControl 5.1.16 |IOAccelerator!F2 438.4.5
|IOSlowAdaptiveClocking!F 1.0.0
X86PlatformPlugin 1.0.0
IOPlatformPlugin!F 6.0.0d8
!ASMBus!C 1.0.18d1 |IOGraphics!F 575.1
!AThunderboltEDMSink 4.2.3 @kext.triggers 1.0 |Broadcom!BHost!CUSBTransport 7.0.4f6 |IO!BHost!CUSBTransport 7.0.4f6
|IO!BHost!CTransport 7.0.4f6 |IO!B!F 7.0.4f6 |IO!BPacketLogger 7.0.4f6
usb.!UHub 1.2
usb.networking 5.0.0
usb.!UHostCompositeDevice 1.2 |IOAudio!F 300.2 @vecLib.kext 1.2.0 |IOSerial!F 11 |IOSurface 269.11 @filesystems.hfs.encodings.kext 1
!AThunderboltDPInAdapter 6.2.6
!AThunderboltDPOutAdapter 6.2.6
!AThunderboltDPAdapter!F 6.2.6
!AThunderboltPCIDownAdapter 2.5.4 |IOAHCIBlock!S 316.100.5
!AThunderboltNHI 5.8.6 |IOThunderbolt!F 7.6.0 |IOAHCI!F 290.0.1
usb.!UXHCIPCI 1.2
usb.!UXHCI 1.2 |IOUSB!F 900.4.2
!AEFINVRAM 2.1
!AEFIRuntime 2.1 |IOSMBus!F 1.1 |IOHID!F 2.0.0 $quarantine 4 $sandbox 300.0 @kext.!AMatch 1.0.0d1
DiskImages 493.0.0
!AFDEKeyStore 28.30
!AEffaceable!S 1.0
!AKeyStore 2
!UTDM 489.101.1 |IOSCSIBlockCommandsDevice 422.101.1
!ACredentialManager 1.0
KernelRelayHost 1
!ASEPManager 1.0.1
IOSlaveProcessor 1 |IOTimeSync!F 840.3 |IONetworking!F 3.4 |IOUSBMass!SDriver 157.101.3 |IOSCSIArchitectureModel!F 422.101.1
|IO!S!F 2.1 |IOUSBHost!F 1.2
!UHostMergeProperties 1.2
usb.!UCommon 1.0
!ABusPower!C 1.0 |CoreAnalytics!F 1
!AMobileFileIntegrity 1.0.5 @kext.CoreTrust 1 |IOReport!F 47
!AACPIPlatform 6.1
!ASMC 3.1.9
watchdog 1 |IOPCI!F 2.9 |IOACPI!F 1.4 @kec.pthread 1 @kec.Libm 1 @kec.corecrypto 1.0