Motivation

Substrate/Polkadot v0.9.37/38/39 has demonstrated instabilities for parachains.

e.g.:

• Rococo collator running on aws eks fails and restart every few minutes paritytech/polkadot-sdk#642
• V5.3.0 version node log error: [Relaychain] error=Subsystem(Generated(Context("Signal channel is terminated and empty."))) AstarNetwork/Astar#910

Suggested Solution

We should have a polkadot-v0.9.42 branch available.