Nice to hear that for someone, my tool actually worked..

As the network is working fine "blocked somewhere on the network" can't happen (not with Electra - anyhow - ) If the transaction is on the Blockchain, whoever holds the private key to that adress can unlock it..(with a fully synced wallet, that is...). If we are not talking about mobile wallets: If it's your own wallet, it's likely not fully synced - If its an Exchange - they didn't credit your account because they are lazy, have their wallet offline, or are stealing your funds... (So you would have to check with them..)

If you are, however, talking about BTC or ETH here: BTC and ETH - networks are hopelessly overloaded, so if you don't want to be ripped off by paying heavy transactions fees, your transaction might never make it on the Blockchain - for a large transaction, accepting high fees might make sense, but for small amounts, you might loose a big share of your holdings if you want to transfer them...

Unfortunately, improvement is not very likely to happend soon - ETH is working on it, but progress is slow... And with the Bitcoin community, resistance to improvement is the main idiology since several years - miners and exchanges benefit from the un-usability - and most people do not care enough - so they don't switch to the hundreds of better alternatives (Or rather, there hasn't been a clear leader among the alternatives, and so people that now join out of FOMO just rush in to BTC again, although - from the point of scaleability, it over the point of "best use by" date since at least 4 years..