Im wonder why other mining soft develops don't block his soft to work on Nicehash? After all its war and Nicehash going to collapse with his lame excavator if all other miners stop to work on NH.
Hope they will take my idea serious and give "proper" answer to NH n00bs.

If you start 2 copy on same miner working on same cards its normal to crash...but if you have for example mix AMD/Nvidia and you use option for every miner to use only amd/nvidia they will work normal.
About hash to go up and down and miner restart....its depend from many factors. For example if you mine on multi coin pool like zerg pool and ETH algo your miner will get work for different dags so he will have up and down his MH. If you use Nicehash (not recommend) because your miners often change job from 1 order to another you "loss" time for your miner to generate dags and hash will go up/down all time special with option -gt 0 for auto tune. If you direct mine ETH on any ETH only pool you will have much more stable and constant hash rate....if you dual mine ETH+zill there will be from time to time change in hashrate when you go to mine zill from ETH. If your mem overheat hash will drop too....

When you say "BETA" i hope you are using program download from PhoenixMiner post....because atm alot newbies accounts spam with "NEW BETA" what is virus!

If you know what is it you can share with us

Haven't used forum from years but all this craziness' made me to create account and post my opinion.
For beginning its clear some one attacked Phoenix miner. From long here is non stop fake link about 5.5d and its all from newbies account. Mods doing good job remove them asap but still some people have DL its and maybe got infected.
Some time ago NH announce their qick miner and how its produce similar hash/now they claim best and its NOT true. I have tested its with my 1080ti and its produce less from all other miners....but main problem with Excavator is you cant use it on any other pool different from NH. So its make this miner complete useless.
I have tested every ETH miner and overall most have close speed but reason i use Phoenix is because its support both AMD/NVidia and its working stable....not only this but he have less fee from all other miners. I thinks its main reasons why many  people use it. I don't want to say rest miners is bad just i prefer this.

Now back to NH....i have used them from years when profit is good....what really happened? I can think for 2 scenarios.
 First they did mistake DL fake miner and distribute to his customers. If this is true i cant understand how some one from support in NH can be this INCOMPETENT to make mistake like this and how they don't have system for clear checking all mining soft BEFORE they distribute it to his customers. Its simple disaster quality from NH workers. Simple i CANT TRUST any soft distributed from NH from now. Everything can be malware.
 Second option is if NH did all this intentional and they are behind attack on PhenixMiner. This make more sense....at lest they are not unprofessional n00bs. This is hell lame/dirty move but its just a business i can understand it but i don't want to support it. Also if they made it intentional they put his customer under risk and its not acceptable. Simple i CANT TRUST NH!

So my conclusion from all this is i wont use any more NH because they loss my trust. Its not just my personal rigs....but some farms i gave support and manage...they wont use NH too. Because bigger farms can loss much if here is security breach coming from NH. How im going to explain it?

Thanks to Phenix for his good miner and thanks to all other honest devs making good miners too.

p.s. English is not my native language.