bluetooth losing connection

I keep losing connection with my wireless keyboard and/or mouse. This happens at about once a day, sometimes when the computer goes to sleep, other times right in the middle of typing.

About 30% the time I can use a wired trackball combined with cycling the on/off switch on the keyboard/mouse to get the the connection back but usually it requires a complete restart. Even that in not alway successful on the first restart. If there is another user logged on I have to do forced restart as I can't override the dialog warning without a keyboard. It has been like this for at least three OS upgrades so that is not the problem.

I have deleted the profiles from the bluetooth preferences. this will work for a day or so before returning to the random connection issues Battery life is not a factor as it happens at all stages of battery charge.