I need to find a new patent attorney. I've had 3 rejections in 3 years for a very simple device.

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Consider interviewing more than one lawyer before you make your final choice. Ask if the lawyer has handled similar matters, and what the outcomes were. Also ask if the lawyer has taken any continuing legal education courses which relate to your problem. Going it alone, you can miss and say the wrong things if you are not represented by an advocate as your attorney. This is why experience is a necessary line of inquiry as you look for a skilled counselor.

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Good luck to you.

God bless.

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From your question, it sounds like you are in a sticky situation. I assume that the last reply from the examiner was made finial. If so, there are only a few things that you can do, (1) if any claims were allowed, then the reply should put the application in condition for allowance by deleting all the rejected claims; (2) you can file an appeal, but this is expensive; (3) you can file a request for continued examination, which requires you to pay another fee to the Patent Office. If your initial specification is very bad, I would recommend filing a continuation in part. The application can be redrafted preserving what is good, and amend what is bad. You will retain your filing date for the preserved parts, and get a new filing date for amended parts. You will also have to pay another filing fee for the RCE.
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Your situation is VERY common in the field, and does not necessarily point to a bad patent attorney. I'm not necessarily defending your attorney (he may in fact be sub-par), but it is common for patent applications to go through many rounds of rejections. Has your attorney tried interviewing the Examiner over the phone? Also, when applications are for "very simple devices," it is much more difficult to obtain a patent. What do you think is more likely to get a patent, a very simple device (table, chair, lamp, etc.), or a very complex device (new semiconductor device, etc)?

I agree with Sadiq and haven't heard anything yet that makes me think your attorney is doing a bad job. The patent process is very complex and often frustrating, and the quality of examination can sometimes be low. If your attorney has failed in any regard, it is in communicating to you and preparing you for the difficulty of the process so you knew what you were getting into going in. I would say that 4 rounds of Office actions is average or at least typical, often followed by an appeal when the examiner cannot be reasoned with. Beware of those who tell you what you want to hear. If you call another attorney, I'm sure many will be glad to tell you will be better off working with them, but you would be hard pressed to find someone that will understand the application better than the person who drafted it.