Invalid Price Cache

[TheDenverWest]

Problem statement:
As a trader on the mangos DEX I need to be able to place orders into the book timely so that I can protect my capital and earn profits to pay the DEX and increase revenue for mango holders.

Impact
This issue is making it borderline impossible to place orders or perform other actions on mangos v3. Even when Solana network is hovering above 1700TPS. Other Dapps/smart contracts on Solana are functioning flawlessly at these speeds.

Anecdotally: I have tried over 200 times to write a SOL-PERP order ( of type Stop Loss ) while Solana is hovering above 1700 TPS (4/3/22 4-5AM MST) and haven't gotten a single order through in the last hour. TOW there are multiple people complaining about the issue in the discord. It is becoming a common theme which may be costing mangos holders.

Dev considerations

1. Research into why pyth/Switchboard are having such an issue inserting price data into blocks.
   

2. Research an estimated Solana Txn/s speed above which it will be safe to use Mangos.
   I suggest implementing a warning or some sort of user facing message stating orders have a very high likelihood of failing to confirm below XXXXTPS. This will ensure users are educated about the REAL risk they may be taking on, at least until the research items (1 & 2 ) can be completed.

3. From: IwillNotSaveYou On what the issue may be.
   The bottom line is there's probably some asset whose oracle is bad (i'm not sure which one), and if you hold that asset in your account it effectively siezes the whole account.

Acceptance Criteria:
The issue in item 1 is fully understood and the partners pyth/switchboard are aware and incentivized to work with mango on a resolution.
Users should be able to reliably place and remove orders, deposit and withdraw assets on mangos.v3 when Solana TPS are above the TPS researched in item 2.

[TheDenverWest]

User: KenM#5586
Date: 4/3 5AM MST
Asset: SOL-Perp Order Type: Stop-Limit
Asset: LUNA/USDC Action: BUY
RPC: Triton/Genesys/Serum

[TheDenverWest]

User: Ki#9265
Date: 4/3 5AM MST
Asset: SOL-Perp
Order Type: Stop-Limit
RPC: Triton/Genesys/Serum

[TheDenverWest]

User: Ace10Suted#4114
Date: 4/2 10PM MST
Asset: SRM
Action Type: Withdraw

[TheDenverWest]

User: ToreroRomero#1584
Date: 4/3 5AM MST
Asset:
Action: Withdraw
RPC:

[TheDenverWest]

User: clevelandasd#5827
Date: 4/3 6AM MST
Asset: BTC-PERP
Action: Limit Order [buy + sell]
RPC: https://mango.rpcpool.com/946ef7337da3f5b8d3e4a34e7f88

[TheDenverWest]

INTERESTING:

This account is getting many orders through, even though almost all other users are unable to do any actions at TOW.(withdraw/deposit/place orders/ etc.)
https://trade.mango.markets/account?pubkey=DUp1NPypVm32hniFLY7KqCRtNQ6dM7ipQbTfuXh48gDt

[TheDenverWest]

User: 💎.sol#5896
Date: 4/3 6AM MST
Asset:
Action: Market Close
RPC: Triton

[TheDenverWest]

User: Harm#8517
Date: 4/3 6AM MST
Asset: SOL-PERP
Action: Stop Loss
RPC: Triton/Genesys/Serum

[TheDenverWest]

User: Rando2020#5684
Date: 4/3 6AM MST
Asset:
Action: Withdraw
RPC: Triton/Genesys/Serum