Have you noticed what it is you are doing when it happens. Do you use straps during 'lifting'...are you restricting your circulation with your clothing? Where in your body do you get the pins and needles? Have you changed your lifting weights heavier than it is usual? Have you started doing different 'machines' that might press your body's circulation. There is so many reasons why it might happen and many of them nothing to do with diabetes.
Sometimes it can be something really simple that you just haven't thought of yourself.
Do you test your levels during work out?