Error chia node

[Haysar2019]

Every day I have this error and the farmer stop farming and stays with not synced status.

Chia version is 1.2.11, I did a new installation, not an upgrade.
I'm using Ubuntu Linux 5.13.0-22-generic #22-Ubuntu SMP Fri Nov 5 13:21:36 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
machine with 16GB memory and it's running only farming, not any other process ... I didn't create plots in this machine I copy the new plots to here only.

e <class 'concurrent.futures.process.BrokenProcessPool'>, closing connection {'host': '107.216.163.62', 'port': 8444}. Traceback (most recent call last):
2021-12-10T08:36:33.323 full_node chia.full_node.full_node: ERROR sync from fork point failed err: A child process terminated abruptly, the process pool is not usable anymore
2021-12-10T08:38:54.894 full_node chia.full_node.full_node: ERROR sync from fork point failed err: A child process terminated abruptly, the process pool is not usable anymore
2021-12-10T08:41:38.183 full_node chia.full_node.full_node: ERROR sync from fork point failed err: A child process terminated abruptly, the process pool is not usable anymore
2021-12-10T08:43:51.877 full_node chia.full_node.full_node: ERROR sync from fork point failed err: A child process terminated abruptly, the process pool is not usable anymore
2021-12-10T08:45:44.159 full_node chia.full_node.full_node: ERROR sync from fork point failed err: A child process terminated abruptly, the process pool is not usable anymore
2021-12-10T08:47:46.194 full_node chia.full_node.full_node: ERROR sync from fork point failed err: A child process terminated abruptly, the process pool is not usable anymore
2021-12-10T08:51:04.406 full_node chia.full_node.full_node: ERROR sync from fork point failed err: A child process terminated abruptly, the process pool is not usable anymore
2021-12-10T08:52:46.517 full_node chia.full_node.full_node: WARNING Syncing failed, CancelledError
2021-12-10T08:52:49.188 full_node concurrent.futures : ERROR exception calling callback for <Future at 0x7fcb009cd820 state=finished returned bool>
raise RuntimeError('Event loop is closed')
RuntimeError: Event loop is closed
raise exceptions.IncompleteReadError(incomplete, n)
asyncio.exceptions.IncompleteReadError: 0 bytes read on a total of 2 expected bytes
websockets.exceptions.ConnectionClosedError: code = 1006 (connection closed abnormally [internal]), no reason
raise exceptions.IncompleteReadError(incomplete, n)
asyncio.exceptions.IncompleteReadError: 0 bytes read on a total of 2 expected bytes
websockets.exceptions.ConnectionClosedError: code = 1006 (connection closed abnormally [internal]), no reason

[Haysar2019]

Hi, more error:

itss@itss2:~/chia-blockchain$ Traceback (most recent call last):
File "/home/itss/chia-blockchain/venv/bin/chia_wallet", line 33, in
sys.exit(load_entry_point('chia-blockchain', 'console_scripts', 'chia_wallet')())
File "/home/itss/chia-blockchain/chia/server/start_wallet.py", line 94, in main
return run_service(**kwargs)
File "/home/itss/chia-blockchain/chia/server/start_service.py", line 255, in run_service
return asyncio.run(async_run_service(*args, **kwargs))
File "/usr/lib/python3.9/asyncio/runners.py", line 44, in run
return loop.run_until_complete(main)
File "/usr/lib/python3.9/asyncio/base_events.py", line 642, in run_until_complete
return future.result()
File "/home/itss/chia-blockchain/chia/server/start_service.py", line 249, in async_run_service
return await service.run()
File "/home/itss/chia-blockchain/chia/server/start_service.py", line 171, in run
await self.start()
File "/home/itss/chia-blockchain/chia/server/start_service.py", line 135, in start
await self._node._start(**kwargs)
File "/home/itss/chia-blockchain/chia/wallet/wallet_node.py", line 186, in _start
self.wallet_state_manager = await WalletStateManager.create(
File "/home/itss/chia-blockchain/chia/wallet/wallet_state_manager.py", line 160, in create
self.blockchain = await WalletBlockchain.create(
File "/home/itss/chia-blockchain/chia/wallet/wallet_blockchain.py", line 116, in create
await self._load_chain_from_store()
File "/home/itss/chia-blockchain/chia/wallet/wallet_blockchain.py", line 127, in _load_chain_from_store
height_to_hash, sub_epoch_summaries = await self.block_store.get_peak_heights_dicts()
File "/home/itss/chia-blockchain/chia/wallet/wallet_block_store.py", line 303, in get_peak_heights_dicts
hash_to_prev_hash[bytes.fromhex(row[0])] = bytes.fromhex(row[1])
ValueError: non-hexadecimal number found in fromhex() arg at position 23