OMG!! i seem to have the exact same problems on my 2003 camry altise .. engine cuts off a second or two mostly when there is extra load lke hitting the brakes , indicators on/off. Radio cuts off as well. Took my car to almost 5 different mech and two autoelec and no one can seem to find the problem. the damn thing does not do it when I take it for inspection... very frustrating. Anyway my battery died the other day and the guy from RACV replaced it and also found that the alternator was not charging the battery properly. SO i got the alternator changed, cost about $550 and it hasnt done it for about 5 days now (fingers crossed). With all the posts here obviously this seems to be a problem with 03 models, its amazing that no one can narrow down to what exactly the problem is. Dont know if I should et rid of the car..