Coin is DEAD?
No . But actually this situation happens often with GUA (as well as with some other coins I am following). Someone drops in with high hashrate, raises difficulty too high, then drops out (probably multipool). After that several hours (more often - days) are needed for normal miners to resolve a block
I am watching GUA, and have seen its blockchain stopped for 1-2 or even 3 days before someone moves that again. The real problem is - as soon as a normal miner resolves a block, and diff drops, the damn multipool joins again, takes all the easy blocks blocks and again raises difficulty. This is definitely unhealthy for the coin, but not sure how this could be improved (unfortunately there is no way to ban multipools).
Great explaining. Same happend with FUJI a few days ago.
Dont worry, it will be ok!!